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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Statement of Comprehensive Income [Abstract]        
Net (loss) $ (28.0) $ (40.9) $ (78.8) $ (42.9)
Gain arising during the period 0 138.3 0 138.3
Amortization of actuarial (gains) losses, net 0.3 6.1 0.6 12.9
Amortization of prior service costs (credits) (0.1) 0.5 (0.2) 0.7
Other comprehensive income, before tax 0.2 144.9 0.4 151.9
Income tax expense related to items of other comprehensive income (0.1) (53.9) (0.1) (56.5)
Other comprehensive income, net of tax 0.1 91.0 0.3 95.4
Comprehensive income (loss) $ (27.9) $ 50.1 $ (78.5) $ 52.5