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Retirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]        
Lump Sum Distributions Paid     $ 4.4 $ 0.0
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 cost 0.4 0.5 1.1 1.3
Net periodic benefit cost 2.1 3.4 10.7 10.2
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Lump Sum Distributions Paid     4.4 0.0
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 cost 0.3 0.4 1.0 1.2
Net periodic benefit cost 2.6 2.9 12.1 8.8
Foreign Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Lump Sum Distributions Paid     0.0 0.0
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 cost 0.1 0.1 0.1 0.1
Net periodic benefit cost $ (0.5) $ 0.5 $ (1.4) $ 1.4