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Reorganization Items, Net (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
schedule of reorganization items [Line Items]              
Reorganization Items $ 33.9 $ 29.7 $ 95.4 $ 159.0 $ 159.0 $ 0.0 $ 0.0
Payments for reorganization items, net         68.1    
Professional fee [Member]              
schedule of reorganization items [Line Items]              
Reorganization Items         88.4    
Loss on termination of derivative contracts [Member]              
schedule of reorganization items [Line Items]              
Reorganization Items         75.2    
accounts payable settlement (gains) losses [Member]              
schedule of reorganization items [Line Items]              
Reorganization Items         (1.8)    
Interest Income [Member]              
schedule of reorganization items [Line Items]              
Reorganization Items         (1.8)    
Other reorganization items [Member]              
schedule of reorganization items [Line Items]              
Reorganization Items         $ (1.0)