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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Net income (loss) $ 418.9 $ (44.3) $ 340.1 $ (87.2)
Predecessor [Member]
        
Net income (loss) 418.9 (44.3) 340.1 (87.2)
Gain arising during the period 0 0 0 138.3
Curtailment (gain) recognized in net income (2.2) 0 (2.2) 0
Amortization of actuarial (gains) losses, net 0.3 2.6 0.9 15.5
Amortization of prior service costs (credits) (0.1) 0 (0.3) 0.7
Other comprehensive income (loss), before tax (2.0) 2.6 (1.6) 154.5
Income tax expense related to items of other comprehensive income 0.1 (1.5) 0 (58.0)
Other comprehensive income (loss), net of tax (1.9) 1.1 (1.6) 96.5
Elimination of Predecessor Company accumulated other comprehensive loss 121.7 0 121.7 0
Comprehensive income (loss) 538.7 (43.2) 460.2 9.3
Accumulated Other Comprehensive Income (Loss) [Member] | Predecessor [Member]
        
Net income (loss)     $ 0 $ 0