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Benefit Plans and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Pension Benefits        
Summary of the defined benefit pension plans and other post-retirement benefits        
Service cost $ 2.3 $ 2.3 $ 6.9 $ 7.0
Interest cost 5.2 5.8 15.8 17.4
Expected return on plan assets (7.6) (7.3) (22.7) (21.8)
Amortization of transition obligation     (0.1) (0.1)
Amortization of prior service cost 0.6 0.6 1.7 1.7
Amortization of net actuarial losses 5.6 6.5 16.7 19.4
Net pension expense 6.1 7.9 18.3 23.6
U.S. plans, Pension Benefits        
Summary of the defined benefit pension plans and other post-retirement benefits        
Employer contributions     16.0  
Estimated cash contribution to the Plans in 2016 based on current actuarial calculations     22.0  
Other Postretirement Benefits        
Summary of the defined benefit pension plans and other post-retirement benefits        
Service cost     0.1 0.1
Interest cost 0.1 0.1 0.3 0.3
Amortization of net actuarial losses 0.2 0.1 0.5 0.2
Net pension expense $ 0.3 $ 0.2 $ 0.9 $ 0.6