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Pension Plans and Other Postretirement Benefits (Details1) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Pension Plans Defined Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the year $ 5.7 $ 7.3 $ 11.4 $ 14.7
Interest cost on benefits earned in prior years 30.2 33.4 60.5 66.8
Expected return on plan assets (42.0) (46.0) (84.1) (92.1)
Amortization of prior service cost (credit) 0.3 0.6 0.6 1.2
Amortization of net actuarial loss 15.1 18.5 30.2 37.0
Termination benefits 0.0 0.3 0.0 0.3
Total retirement benefit expense 9.3 14.1 18.6 27.9
Other Postretirement Benefit Plan, Defined Benefit [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost - benefits earned during the year 0.7 0.7 1.4 1.4
Interest cost on benefits earned in prior years 4.5 6.0 9.0 12.0
Expected return on plan assets 0.0 (0.1) 0.0 (0.1)
Amortization of prior service cost (credit) 1.2 (0.7) 2.4 (1.5)
Amortization of net actuarial loss 3.6 3.5 7.2 7.0
Termination benefits 0.0 0.0 0.0 0.0
Total retirement benefit expense $ 10.0 $ 9.4 $ 20.0 $ 18.8