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Retirement Plans and Other Post-Retirement Benefits (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Change in Benefit Obligation      
Balance at end of year $ 36.4 $ 31.8  
Change in Plan Assets      
Fair value of plan assets at end of year 545.7 503.5  
Pension Benefits [Member]
      
Change in Benefit Obligation      
Balance at beginning of year 470.2 434.3  
Service cost 11.3 10.3 9.5
Interest cost 23.0 24.2 23.9
Plan amendments 5.5 2.0  
Actuarial (gain)/loss 46.7 33.8  
Benefits paid (28.3) (34.4)  
Balance at end of year 528.4 470.2 434.3
Change in Plan Assets      
Fair value of plan assets at beginning of year 498.2 526.4  
Actual (loss) return on plan assets 68.1 (2.6)  
Total contributions 1.8 8.8  
Benefits paid (28.3) (34.4)  
Intra plan transfers 5.9    
Fair value of plan assets at end of year 545.7 498.2 526.4
Funded status at end of year 17.3 28.0  
Other Benefits [Member]
      
Change in Benefit Obligation      
Balance at beginning of year 56.8 58.5  
Service cost 2.8 2.9 2.9
Interest cost 2.4 2.8 3.4
Participant contributions 1.4 1.7  
Actuarial (gain)/loss 4.2 (4.4)  
Benefits paid (4.6) (4.7)  
Balance at end of year 63.0 56.8 58.5
Change in Plan Assets      
Fair value of plan assets at beginning of year 5.3 6.2  
Actual (loss) return on plan assets 0.6    
Total contributions 4.6 3.8  
Benefits paid (4.6) (4.7)  
Intra plan transfers (5.9)    
Fair value of plan assets at end of year   5.3 6.2
Funded status at end of year $ (63.0) $ (51.5)