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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Predecessor [Member]        
Net income (loss)   $ 418.9   $ 340.1
Curtailment (gain) recognized in net income (loss)   (2.2)   (2.2)
Amortization of actuarial (gains) losses, net   0.3   0.9
Amortization of prior service costs (credits)   (0.1)   (0.3)
Other comprehensive income (loss), before tax   (2.0)   (1.6)
Income tax expense related to items of other comprehensive income   0.1   0.0
Other comprehensive income (loss), net of tax   (1.9)   (1.6)
Elimination of Predecessor Company accumulated other comprehensive loss   121.7   121.7
Comprehensive income (loss)   $ 538.7   $ 460.2
Successor [Member]        
Net income (loss) $ (55.1)   $ (85.6)  
Curtailment (gain) recognized in net income (loss) 0.0   0.0  
Amortization of actuarial (gains) losses, net 0.0   0.0  
Amortization of prior service costs (credits) (0.1)   (0.2)  
Other comprehensive income (loss), before tax (0.1)   (0.2)  
Income tax expense related to items of other comprehensive income 0.0   0.0  
Other comprehensive income (loss), net of tax (0.1)   (0.2)  
Elimination of Predecessor Company accumulated other comprehensive loss 0.0   0.0  
Comprehensive income (loss) $ (55.2)   $ (85.8)