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Pension Plans and Other Postretirement Benefits (Details1) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Pension Plans Defined Benefit
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost - benefits earned during the year $ 7.4 $ 10.0
Interest cost on benefits earned in prior years 33.4 30.3
Expected return on plan assets (46.1) (43.8)
Amortization of prior service cost (credit) 0.6 0.8
Amortization of net actuarial loss 18.5 29.2
Total retirement benefit expense 13.8 26.5
Other Postretirement Benefit Plan, Defined Benefit [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Service cost - benefits earned during the year 0.7 0.8
Interest cost on benefits earned in prior years 6.0 5.6
Expected return on plan assets 0 (0.1)
Amortization of prior service cost (credit) (0.8) (4.6)
Amortization of net actuarial loss 3.5 4.3
Total retirement benefit expense $ 9.4 $ 6.0