Postretirement and Other Benefits - Expected Future Benefit Payments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
United States \| Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2020	$ 8.5
2021	8.4
2022	8.4
2023	8.1
2024	8.0
2025 - 2029	37.6
Employer contributions	0.0	$ 0.0
United States \| OPEB Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2020	0.2
2021	0.2
2022	0.1
2023	0.1
2024	0.1
2025 - 2029	0.3
Employer contributions	0.0	0.0
France \| Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2020	1.6
2021	1.0
2022	0.6
2023	1.7
2024	1.3
2025 - 2029	8.0
Employer contributions	$ 1.1	$ 1.2

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.

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