Retirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Actual contribution to defined benefit pension plans	$ 3.5
United States Pension Plan of US Entity [Member]
Components of net periodic benefit cost:
Service cost	0.0	$ 0.0
Interest cost	2.2	2.4
Expected return on plan assets	(3.3)	(3.7)
Amortization of unrecognized prior service credit	(0.2)	(0.2)
Amortization of unrecognized loss	1.1	1.2
Net periodic benefit (income) cost	(0.2)	(0.3)
Foreign Pension Plan [Member]
Components of net periodic benefit cost:
Service cost	4.3	4.0
Interest cost	2.6	3.2
Expected return on plan assets	(5.6)	(6.3)
Amortization of unrecognized prior service credit	0.0	0.0
Amortization of unrecognized loss	1.9	1.6
Net periodic benefit (income) cost	3.2	2.5
Other Postretirement Benefit Plan [Member]
Components of net periodic benefit cost:
Service cost	0.0	0.1
Interest cost	0.8	1.0
Expected return on plan assets	0.0	0.0
Amortization of unrecognized prior service credit	(1.0)	(1.2)
Amortization of unrecognized loss	0.3	0.5
Net periodic benefit (income) cost	$ 0.1	$ 0.4
Scenario, Forecast [Member] | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Contributions in Current Fiscal Year			$ 15.0
Scenario, Forecast [Member] | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Contributions in Current Fiscal Year			$ 25.0