Quarterly report pursuant to Section 13 or 15(d)

Variable Interest Entities (Details)

v3.5.0.2
Variable Interest Entities (Details) - USD ($)
$ in Millions
 1 Months Ended 9 Months Ended
Dec. 11, 2012
Oct. 03, 2012
Aug. 30, 2011
Jan. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Primary Beneficiary [Member]            
Variable Interest Entity [Line Items]            
Tax credit percentage         39.00%  
Percentage of recapture         100.00%  
Recapture period         7 years  
Assets         $ 140.9 $ 140.9
Liabilities         $ 104.2 $ 104.2
NMTC 1 [Member] | Primary Beneficiary [Member]            
Variable Interest Entity [Line Items]            
Variable Interest Entity, Financial or Other Support, Amount     $ 58.3      
Interest rate percentage     1.00%      
NMTC 1 [Member] | Minimum [Member] | Primary Beneficiary [Member]            
Variable Interest Entity [Line Items]            
Interest rate percentage     1.00%      
NMTC 1 [Member] | Maximum [Member] | Primary Beneficiary [Member]            
Variable Interest Entity [Line Items]            
Interest rate percentage     3.96%      
NMTC 2 [Member] | Primary Beneficiary [Member]            
Variable Interest Entity [Line Items]            
Variable Interest Entity, Financial or Other Support, Amount   $ 37.7        
Interest rate percentage   1.00%        
NMTC 2 [Member] | Minimum [Member] | Primary Beneficiary [Member]            
Variable Interest Entity [Line Items]            
Interest rate percentage   0.7099%        
NMTC 2 [Member] | Maximum [Member] | Primary Beneficiary [Member]            
Variable Interest Entity [Line Items]            
Interest rate percentage   0.7693%        
NMTC 3 [Member] | Primary Beneficiary [Member]            
Variable Interest Entity [Line Items]            
Variable Interest Entity, Financial or Other Support, Amount $ 8.2          
Interest rate percentage 1.00%          
NMTC 3 [Member] | Maximum [Member] | Primary Beneficiary [Member]            
Variable Interest Entity [Line Items]            
Interest rate percentage 1.35%          
Next Generation Carrier-Class Communications Services Firm [Member]            
Variable Interest Entity [Line Items]            
Ownership percentage         40.80%  
Next Generation Carrier-Class Communications Services Firm [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]            
Variable Interest Entity [Line Items]            
Variable Interest Entity, Financial or Other Support, Amount       $ 3.0    
US Bancorp [Member] | NMTC 1 [Member] | Primary Beneficiary [Member]            
Variable Interest Entity [Line Items]            
Amount to other entity     $ 22.4      
US Bancorp [Member] | NMTC 2 [Member] | Primary Beneficiary [Member]            
Variable Interest Entity [Line Items]            
Amount to other entity   $ 17.5        
US Bancorp [Member] | NMTC 3 [Member] | Primary Beneficiary [Member]            
Variable Interest Entity [Line Items]            
Amount to other entity $ 3.8          
Community Development Entities [Member] | NMTC 1 [Member] | Primary Beneficiary [Member]            
Variable Interest Entity [Line Items]            
Amount to other entity     $ 76.8      
Community Development Entities [Member] | NMTC 2 [Member] | Primary Beneficiary [Member]            
Variable Interest Entity [Line Items]            
Amount to other entity   $ 55.2        
Community Development Entities [Member] | NMTC 3 [Member] | Primary Beneficiary [Member]            
Variable Interest Entity [Line Items]            
Amount to other entity $ 12.0