XML 69 R54.htm IDEA: XBRL DOCUMENT v3.7.0.1
Intangible Assets Schedule of Intangible Assets and Excess Reorganization Value (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items]      
Amortizable intangible assets, gross $ 123.5 $ 123.5  
Accumulated intangible asset amortization (30.2) (17.7)  
Amortizable intangible assets, net 93.3 105.8  
Excess reorganization value     $ 137.2
Impairment of excess reorganization value $ 0.0 (137.2)  
Average useful life of finite-lived intangible assets 15 years    
Contract-Based Intangible Assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortizable intangible assets, gross $ 54.6 54.6  
Accumulated intangible asset amortization (19.9) (12.0)  
Amortizable intangible assets, net 34.7 42.6  
Customer-Related Intangible Assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortizable intangible assets, gross 68.9 68.9  
Accumulated intangible asset amortization (10.3) (5.7)  
Amortizable intangible assets, net $ 58.6 $ 63.2