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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net income (loss) $ 125.4 $ (129.5) $ 804.3
Other comprehensive income (loss):      
Net foreign currency translation adjustment 4.7 (38.8) (74.4)
Net change in postretirement benefit plans, net of tax impacts of $0, $399.0 and $(18.0), respectively (42.3) (508.5) 28.7
Net change in unrealized loss on investment securities, net of tax impacts of $1.0, $7.8 and $(0.3), respectively 1.0 (12.8) (0.6)
Other comprehensive loss (36.6) (560.1) (46.2)
Comprehensive income (loss) 88.8 (689.6) 758.1
Net change in postretirement benefit plans, net of tax:      
Prior service credit (cost), net of tax (expense) benefit of $0, $(1.0) and $1.1, respectively 3.1 2.0 (1.8)
Net actuarial loss, net of tax benefit of $0, $443.1 and $14.5, respectively (56.7) (580.8) (23.7)
Foreign currency translation (0.4)    
Unrealized changes in postretirement benefit plans, net of tax (54.0) (578.8) (25.5)
Amortization of prior service costs, net of tax benefit of $0, $(1.0) and $(0.9), respectively 0.8 1.6 1.4
Amortization of net actuarial loss, net of tax benefit of $0, $(42.1) and $(32.7), respectively 10.9 68.7 52.8
Total amortization from accumulated other comprehensive loss into net periodic postretirement cost, net of tax 11.7 70.3 54.2
Net change in postretirement benefit plans, net of tax (42.3) (508.5) 28.7
Net change in unrealized loss on investment securities, net of tax:      
Unrealized holding (losses) gains arising during period, net of tax benefit (expense) of $0, $1.7 and $(2.8), respectively   (2.8) 4.5
Realized losses (gains) arising during the period, net of tax expense of $1.0, $6.1 and $3.1, respectively 1.0 (10.0) (5.2)
Net change in unrealized loss on investment securities, net of tax $ 1.0 $ (12.8) $ (0.6)