Pension Plans and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Defined contribution retirement plan
Costs related to defined contribution retirement plan		$ 3.3
United States
Defined contribution retirement plan
Percentage that the employer contributes of employee contributions under 401(k) plan	100.00%
Maximum percentage of employee compensation match by employer to defined contribution plan	6.00%
Costs related to defined contribution retirement plan	$ 3.3
Enhanced Defined Contribution Plans [Member]
Defined contribution retirement plan
Costs related to defined contribution retirement plan	$ 1.2	$ 0.8
Enhanced Defined Contribution Plans [Member] | United States
Defined contribution retirement plan
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	4.00%