Retirement Benefit Plans - Estimated Future Payments (Details) $ in Millions	Dec. 31, 2016 USD ($)
U.S. Plans:
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2017	$ 22.8
2018	19.8
2019	19.7
2020	19.6
2021	19.3
2022-2026	89.8
Non-U.S. Plans:
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2017	17.7
2018	18.7
2019	17.3
2020	19.1
2021	19.5
2022-2026	110.7
U.S. other postretirement benefit plans [Member]
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2017	14.8
2018	13.7
2019	12.6
2020	12.1
2021	11.0
2022-2026	$ 39.6