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Intangible Assets Schedule of Intangible Assets and Excess Reorganization Value (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items]      
Amortizable intangible assets, gross $ 123.5 $ 123.5  
Accumulated intangible asset amortization (17.7) (4.3)  
Amortizable intangible assets, net 105.8 119.2  
Excess reorganization value 0.0 137.2 $ 137.2
Impairment of excess reorganization value $ (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 (12.0) (3.2)  
Amortizable intangible assets, net 42.6 51.4  
Customer-Related Intangible Assets [Member]      
Finite-Lived Intangible Assets [Line Items]      
Amortizable intangible assets, gross 68.9 68.9  
Accumulated intangible asset amortization (5.7) (1.1)  
Amortizable intangible assets, net $ 63.2 $ 67.8