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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Pension Plans Defined Benefit
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the year $ 7.3 $ 10.0 $ 14.7 $ 20.0
Interest cost on benefits earned in prior years 33.4 30.3 66.8 60.6
Expected return on plan assets (46.0) (43.8) (92.1) (87.6)
Amortization of prior service cost (credit) 0.6 0.7 1.2 1.5
Amortization of net actuarial loss 18.5 29.2 37.0 58.4
Termination benefits 0.3 0 0.3 0
Total retirement benefit expense 14.1 26.4 27.9 52.9
Other Postretirement Benefit Plan, Defined Benefit [Member]
        
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the year 0.7 0.8 1.4 1.6
Interest cost on benefits earned in prior years 6.0 5.6 12.0 11.2
Expected return on plan assets (0.1) (0.1) (0.1) (0.2)
Amortization of prior service cost (credit) (0.7) (4.5) (1.5) (9.1)
Amortization of net actuarial loss 3.5 4.3 7.0 8.6
Termination benefits 0 0 0 0
Total retirement benefit expense $ 9.4 $ 6.1 $ 18.8 $ 12.1