Pension Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans
Estimated U.S. federal subsidies expected to be received under the Medicare Prescription Drug, Improvement and Modernization Act of 2003, no more than	$ 0.3
Domestic Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans
Employer contributions	2.6	$ 0.0
Defined benefit plan, estimated future employer contributions in next fiscal year	10.0
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity
Expected future benefit payments in 2018	13.7
Expected future benefit payments in 2019	8.5
Expected future benefit payments in 2020	8.6
Expected future benefit payments in 2021	8.0
Expected future benefit payments in 2022	8.4
Expected future benefit payments in 2023-2027	37.2
Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans
Employer contributions	17.5	23.2
Defined benefit plan, estimated future employer contributions in next fiscal year	18.0
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity
Expected future benefit payments in 2018	22.3
Expected future benefit payments in 2019	23.8
Expected future benefit payments in 2020	21.6
Expected future benefit payments in 2021	22.3
Expected future benefit payments in 2022	23.5
Expected future benefit payments in 2023-2027	124.0
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans
Employer contributions	4.3	$ 4.2
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity
Expected future benefit payments in 2018	3.2
Expected future benefit payments in 2019	3.0
Expected future benefit payments in 2020	2.8
Expected future benefit payments in 2021	2.6
Expected future benefit payments in 2022	2.4
Expected future benefit payments in 2023-2027	$ 10.4