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Retirement Plans and Other Post-Retirement Benefits (Details 5) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of pension and post retirement medical benefit plans      
One-time settlement charge   $ 2.0  
Pension Benefits [Member]
      
Schedule of pension and post retirement medical benefit plans      
Service cost 11.3 10.3 9.5
Interest cost 23.0 24.2 23.9
Expected return on plan assets (42.2) (42.0) (40.3)
Amortization of prior service cost/(credit) 2.5 2.6 2.5
Amortization of actuarial loss 17.0 13.3 13.6
One-time settlement charge   2.0  
Total net periodic benefit cost 11.6 10.4 9.2
Other Benefits [Member]
      
Schedule of pension and post retirement medical benefit plans      
Service cost 2.8 2.9 2.9
Interest cost 2.4 2.8 3.4
Expected return on plan assets (0.5) (0.5) (0.5)
Amortization of prior service cost/(credit) (0.9) (1.2) (1.2)
Amortization of actuarial loss 0.7 0.9 1.5
Total net periodic benefit cost $ 4.5 $ 4.9 $ 6.1