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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, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)        
Net income (loss) $ 4.5 $ (6.9) $ (116.3) $ (44.7)
Amortization of prior service costs 0.3 0.4 1.1 1.2
Amortization of actuarial losses 6.2 2.9 18.2 8.9
Other comprehensive income, before tax 6.5 3.3 19.3 10.1
Income tax expense related to items of other comprehensive income (2.4) (1.2) (7.0) (3.7)
Other comprehensive income, net of tax 4.1 2.1 12.3 6.4
Comprehensive income (loss) $ 8.6 $ (4.8) $ (104.0) $ (38.3)