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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - Equity Component [Domain] - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Predecessor [Member]        
Net income (loss)   $ (28.0)   $ (78.8)
Amortization of actuarial (gains) losses, net   0.3   0.6
Amortization of prior service costs (credits)   (0.1)   (0.2)
Other comprehensive income (loss), before tax   0.2   0.4
Income tax expense related to items of other comprehensive income   (0.1)   (0.1)
Other comprehensive income (loss), net of tax   0.1   0.3
Comprehensive income (loss)   $ (27.9)   $ (78.5)
Successor [Member]        
Net income (loss) $ (15.1)   $ (30.5)  
Amortization of actuarial (gains) losses, net 0.0   0.0  
Amortization of prior service costs (credits) 0.0   (0.1)  
Other comprehensive income (loss), before tax 0.0   (0.1)  
Income tax expense related to items of other comprehensive income 0.0   0.0  
Other comprehensive income (loss), net of tax 0.0   (0.1)  
Comprehensive income (loss) $ (15.1)   $ (30.6)