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Postretirement and Other Benefits - Expected Future Benefit Payments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
United States | Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2019	$ 8.6
2020	8.4
2021	8.3
2022	8.2
2023	8.0
2024 - 2028	38.3
Employer contributions	0.0	$ 0.0
United States | OPEB Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2019	0.1
2020	0.1
2021	0.1
2022	0.1
2023	0.1
2024 - 2028	0.3
Employer contributions	0.0	0.3
France | Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2019	2.4
2020	0.5
2021	1.2
2022	0.8
2023	1.8
2024 - 2028	7.3
Employer contributions	$ 1.2	$ 1.9

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