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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, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)        
Net (loss) $ (92.0) $ (21.2) $ (120.8) $ (37.8)
Amortization of prior service costs 0.4 0.4 0.8 0.8
Amortization of actuarial losses 6.0 2.8 12.0 6.0
Other comprehensive income, before tax 6.4 3.2 12.8 6.8
Income tax (expense) benefit related to items of other comprehensive income (2.3) (1.2) (4.6) (2.5)
Other comprehensive income, net of tax 4.1 2.0 8.2 4.3
Comprehensive (loss) $ (87.9) $ (19.2) $ (112.6) $ (33.5)