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Pension Plans and Other Postretirement Benefits (Details 1) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the year $ 39.0 $ 35.0 $ 30.0
Interest cost on benefits earned in prior years 122.8 132.4 135.1
Expected return on plan assets (176.0) (181.4) (192.1)
Amortization of prior service cost (credit) 3.0 6.4 11.3
Amortization of net actuarial loss 111.8 105.2 71.3
Termination benefits 4.8 0 0.8
Total retirement benefit expense 105.4 97.6 56.4
Other Postretirement Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the year 3.2 3.1 3.2
Interest cost on benefits earned in prior years 22.4 26.1 27.5
Expected return on plan assets (0.5) (0.8) (1.0)
Amortization of prior service cost (credit) (18.2) (18.2) (18.3)
Amortization of net actuarial loss 17.2 14.6 9.9
Termination benefits 1.3 0 0.2
Total retirement benefit expense $ 25.4 $ 24.8 $ 21.5