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Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Components of net periodic benefit cost:        
Service cost $ 3.5 $ 3.7 $ 10.4 $ 11.0
Interest cost 8.1 9.2 24.1 28.2
Expected return on plan assets (9.9) (10.0) (29.3) (30.3)
Amortization of prior service credit 0.4 0.5 1.1 1.3
Net periodic benefit cost 2.1 3.4 10.7 10.2
Postretirement Benefit Plans [Member]        
Components of net periodic benefit cost:        
Service cost 0.0 0.1 0.1 0.3
Interest cost 2.3 2.7 6.8 8.2
Expected return on plan assets (1.4) (1.6) (4.2) (4.9)
Amortization of prior service credit (0.3) 0.2 (0.8) 0.7
Net periodic benefit cost 0.6 1.4 1.9 4.3
Pension Plan [Member]        
Components of net periodic benefit cost:        
Service cost 3.1 3.3 9.2 9.9
Interest cost 6.2 6.6 18.5 20.0
Expected return on plan assets (7.0) (7.4) (21.0) (22.3)
Amortization of prior service credit 0.3 0.4 1.0 1.2
Net periodic benefit cost 2.6 2.9 12.1 8.8
Foreign Plan [Member]        
Components of net periodic benefit cost:        
Service cost 0.4 0.4 1.2 1.1
Interest cost 1.9 2.6 5.6 8.2
Expected return on plan assets (2.9) (2.6) (8.3) (8.0)
Amortization of prior service credit 0.1 0.1 0.1 0.1
Net periodic benefit cost $ (0.5) $ 0.5 $ (1.4) $ 1.4