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Intangible Assets Schedule of Intangible Assets and Excess Reorganization Value (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Amortizable intangible assets, gross $ 123.5 $ 123.5
Accumulated intangible asset amortization (23.6) (17.7)
Amortizable intangible assets, net $ 99.9 105.8
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 (15.6) (12.0)
Amortizable intangible assets, net 39.0 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 (8.0) (5.7)
Amortizable intangible assets, net $ 60.9 $ 63.2