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Retirement Plans and Other Post-Retirement Benefits (Details 6) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pension Benefits [Member]
      
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Actuarial loss $ 20.6 $ 76.5  
Prior service cost 5.5 2.1  
Amortization of prior service cost 2.5 2.6 2.5
Amortization of actuarial losses (17.0) (13.3)  
Total recognized in other comprehensive loss 6.6 62.7  
Total recognized in net periodic benefit cost and other comprehensive loss 18.2 73.1  
Other Benefits [Member]
      
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss)      
Actuarial loss 4.0 (3.8)  
Amortization of prior service cost (0.9) (1.2) (1.2)
Amortization of actuarial losses (0.7) (0.9)  
Total recognized in other comprehensive loss 4.2 (3.5)  
Total recognized in net periodic benefit cost and other comprehensive loss $ 8.7 $ 1.4