Retirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Actual contribution to defined benefit pension plans			$ 7.6
Scenario, Forecast [Member] | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year					$ 15.0
Scenario, Forecast [Member] | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year					$ 25.0
Other Postretirement Benefits Plan [Member]
Components of net periodic benefit cost:
Service cost	$ 0.1	$ 0.0	0.1	$ 0.1
Interest cost	0.8	0.9	1.6	1.9
Expected return on plan assets	0.0	0.0	0.0	0.0
Amortization of unrecognized prior service credit	(1.0)	(1.2)	(2.0)	(2.4)
Amortization of unrecognized loss	0.3	0.6	0.6	1.1
Net periodic benefit (income) cost	0.2	0.3	0.3	0.7
Pension Plan [Member] | UNITED STATES
Components of net periodic benefit cost:
Service cost	0.0	0.0	0.0	0.0
Interest cost	2.2	2.4	4.4	4.8
Expected return on plan assets	(3.2)	(3.8)	(6.5)	(7.5)
Amortization of unrecognized prior service credit	(0.2)	(0.2)	(0.4)	(0.4)
Amortization of unrecognized loss	1.0	1.3	2.1	2.5
Net periodic benefit (income) cost	(0.2)	(0.3)	(0.4)	(0.6)
Pension Plan [Member] | Non-US [Member]
Components of net periodic benefit cost:
Service cost	4.5	4.2	8.8	8.2
Interest cost	2.6	3.3	5.2	6.5
Expected return on plan assets	(5.8)	(6.3)	(11.4)	(12.6)
Amortization of unrecognized prior service credit	0.0	0.0	0.0	0.0
Amortization of unrecognized loss	1.9	1.5	3.8	3.1
Net periodic benefit (income) cost	$ 3.2	$ 2.7	$ 6.4	$ 5.2