Pension Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated benefit obligation	$ 92.4	$ 81.4
Expected contributions, 2021	0.3
Expected defined benefit pension plan expense for 2021	5.4
Defined benefit pension plan expense	$ 4.9
Expected return on plan assets, lookback period	10 years
US Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan expense	$ 7.3	13.5	$ 12.8
Unfunded status of plans	0.9
Future benefit payments, 2021	0.1
Future benefit payments, 2022	0.1
Future benefit payments, 2023	0.1
Future benefit payments, 2024	0.1
Future benefit payments, 2025	0.1
Future benefit payments, 2026-2030	0.3
Foreign Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan expense	2.1	$ 2.8	$ 3.7
Unfunded status of plans	88.0
Future benefit payments, 2021	3.1
Future benefit payments, 2022	3.4
Future benefit payments, 2023	3.4
Future benefit payments, 2024	3.8
Future benefit payments, 2025	3.9
Future benefit payments, 2026-2030	25.3
Unfunded Plan | US Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Unfunded status of plans	0.9
Unfunded Plan | Foreign Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Unfunded status of plans	$ 88.3