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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
CONSOLIDATED STATEMENTS OF OPERATIONS      
Net income (loss) $ (1,200.6) $ (491.1) $ 7.5
Valuation gain (loss) for pension and postretirement health and life benefit plans (Note 12) (55.1) (136.2) 33.5
Amortization of actuarial losses (Note 12) 24.2 16.2 18.7
Amortization of prior service costs (credits) (Note 12) 1.5 1.6 (6.3)
Other comprehensive income (loss), pre-tax (29.4) (118.4) 45.9
Valuation gain (loss) for pension and postretirement health and life benefit plans - tax (expense) benefit     (18.8)
Amortization of actuarial losses -tax (expense) benefit     (6.9)
Amortization of prior service costs (credits) - tax (expense) benefit     3.1
Income tax (expense) benefit related to items of other comprehensive income (loss)     (22.6)
Other comprehensive income (loss), net of tax (29.4) (118.4) 23.3
Comprehensive income (loss) $ (1,230.0) $ (609.5) $ 30.8