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Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance $ (196.5) $ (254.3) $ (291.9) $ (262.5)
Gain arising during the period 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)
Total reclassifications for the period, 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
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance $ (195.4) $ (250.2) $ (195.4) $ (250.2)