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CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ (44.3) $ 4.5 $ (87.2) $ (116.3)
Gain arising during the period (Note 11) 0 0 138.3 0
Amortization of actuarial (gains) losses, net (Note 11) 2.6 6.2 15.5 18.2
Amortization of prior service costs (Note 11) 0 (0.3) (0.7) (1.1)
Other comprehensive income, before tax 2.6 6.5 154.5 19.3
Income tax expense related to items of other comprehensive income (1.5) (2.4) (58.0) (7.0)
Other comprehensive income, net of tax 1.1 4.1 96.5 12.3
Comprehensive income (loss) $ (43.2) $ 8.6 $ 9.3 $ (104.0)