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Pension Plans and Other Postretirement Benefits (Details1) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
[PensionPlansDefinedBenefitMember]
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the year $ 10.0 $ 8.7 $ 20.0 $ 17.5
Interest cost on benefits earned in prior years 30.3 33.1 60.6 66.2
Expected return on plan assets (43.8) (45.3) (87.6) (90.7)
Amortization of prior service cost (credit) 0.7 1.6 1.5 3.2
Amortization of net actuarial loss 29.2 26.3 58.4 52.6
Total retirement benefit expense 26.4 24.4 52.9 48.8
[OtherPostretirementBenefitPlansDefinedBenefitMember]
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the year 0.8 0.8 1.6 1.6
Interest cost on benefits earned in prior years 5.6 6.5 11.2 13.0
Expected return on plan assets (0.1) (0.2) (0.2) (0.4)
Amortization of prior service cost (credit) (4.5) (4.6) (9.1) (9.1)
Amortization of net actuarial loss 4.3 3.7 8.6 7.3
Total retirement benefit expense $ 6.1 $ 6.2 $ 12.1 $ 12.4