Retirement Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Americas [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Interest cost	$ 0.7	$ 0.7	$ 1.3	$ 1.4
Expected return on plan assets	(1.3)	(1.3)	(2.5)	(2.5)
Settlement loss	(0.7)	0.0	(0.7)	0.0
Amortization of actuarial loss	0.4	0.5	0.9	0.9
Amortization of prior service credit	(0.1)	(0.1)	(0.2)	(0.2)
Total	0.4	(0.2)	$ 0.2	(0.4)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate			4.05%		3.40%
Defined Benefit Plan, Change in Funded (Unfunded) Status of Plan Due to Remeasurement	0.3		$ 0.3
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, before Tax			1.0
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, Net of Tax			0.7
Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.0	0.0	0.1	0.1
Interest cost	1.1	1.0	2.1	2.0
Expected return on plan assets	(2.7)	(2.3)	(5.4)	(4.5)
Amortization of actuarial loss	0.5	0.7	1.0	1.3
Total	$ (1.1)	$ (0.6)	$ (2.2)	$ (1.1)