Restructuring Charge - Restructuring Reserve and Utilization (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restructuring Reserve [Rollforward]
Balance at beginning of period	$ 9.7	$ 10.3
Charge taken during the period	4.4	2.0
Payments made during period	(3.3)	(6.0)	[1]
Balance at end of period	10.8	6.3
Severance and Termination
Restructuring Reserve [Rollforward]
Balance at beginning of period	2.6	5.8
Charge taken during the period	4.7	2.0
Payments made during period	(2.4)	(4.6)
Balance at end of period	4.9	3.2
Contract Termination and Other Exit Costs
Restructuring Reserve [Rollforward]
Balance at beginning of period	7.1	4.5
Charge taken during the period	(0.3)	0.0
Payments made during period	(0.9)	(1.4)
Balance at end of period	$ 5.9	$ 3.1

[1] See discussion in Note 1 - Basis of Presentation for further detail regarding the elimination of the International lag reporting.