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Acuumlated Other Comprehensive Income (Loss) (Table) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance $ (291.9) $ (262.5)
Amortization of actuarial (gains) losses, net 6.8 6.0
Amortization of prior service costs 0.2 0.4
Total reclassifications for the period, before tax 7.0 6.4
Income tax expense related to items of other comprehensive income (2.6) (2.3)
Other comprehensive income, net of tax 4.4 4.1
Amounts reclassified from accumulated other comprehensice income (loss), net of tax 4.4 4.1
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance (287.5) (258.4)
Other comprehensive income, before tax $ 7.0 $ 6.4