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Acuumlated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]        
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance $ (287.5) $ (258.4) $ (291.9) $ (262.5)
Gain arising during the period 138.3 0 138.3 0
Amortization of actuarial (gains) losses, net (Note 11) 6.1 6.0 12.9 12.0
Amortization of prior service costs (Note 11) 0.5 0.4 0.7 0.8
Total reclassifications for the period, before tax 144.9 6.4 151.9 12.8
Income tax expense related to items of other comprehensive income (53.9) (2.3) (56.5) (4.6)
Other comprehensive income, net of tax 91.0 4.1 95.4 8.2
Amounts reclassified from accumulated other comprehensice income (loss), net of tax 91.0 4.1 95.4 8.2
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance (196.5) (254.3) (196.5) (254.3)
Other comprehensive income, before tax $ 144.9 $ 6.4 $ 151.9 $ 12.8