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Retirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Components of net periodic benefit cost:        
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit $ (16.9) $ (5.3) $ (16.9) $ (3.1)
Pension Plan [Member]        
Components of net periodic benefit cost:        
Service cost 3.0 3.7 9.0 10.9
Interest cost 7.5 7.8 23.2 23.2
Expected return on plan assets 8.8 10.5 26.8 31.0
Amortization of prior service cost 0.4 0.5 1.3 1.3
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit (7.0) (4.8) (7.0) (2.4)
Net periodic benefit cost 9.1 6.3 13.7 6.8
Pension Plan [Member] | UNITED STATES        
Components of net periodic benefit cost:        
Service cost 2.6 3.3 7.8 9.7
Interest cost 5.7 6.0 17.7 17.7
Expected return on plan assets 6.4 7.6 19.2 22.2
Amortization of prior service cost 0.4 0.4 1.2 1.2
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit (7.0) (4.8) (7.0) (2.4)
Net periodic benefit cost 9.3 6.9 14.5 8.8
Defined Benefit Plan, Plan Assets, Contributions by Employer 24.0   34.0  
Pension Plan [Member] | Foreign Plan [Member]        
Components of net periodic benefit cost:        
Service cost 0.4 0.4 1.2 1.2
Interest cost 1.8 1.8 5.5 5.5
Expected return on plan assets 2.4 2.9 7.6 8.8
Amortization of prior service cost 0.0 0.1 0.1 0.1
Defined Benefit Plan, Actuarial Gain (Loss), Immediate Recognition as Component in Net Periodic Benefit (Cost) Credit 0.0 0.0 0.0 0.0
Net periodic benefit cost $ (0.2) $ (0.6) $ (0.8) $ (2.0)