Restructuring Charge - Restructuring Reserve and Utilization (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Reserve [Rollforward]
Balance at beginning of period	$ 10.8	$ 9.7	$ 6.3	$ 10.3	$ 9.7	$ 10.3
Charge taken during the period	8.3	4.4	4.6	2.0
Payments made during period	(4.9)	(3.3)	(4.5)	(6.0)	(8.2)	(10.5)	[1]
Balance at end of period	14.2	10.8	6.4	6.3	14.2	6.4
Severance and Termination
Restructuring Reserve [Rollforward]
Balance at beginning of period	4.9	2.6	3.2	5.8	2.6	5.8
Charge taken during the period	8.0	4.7	4.2	2.0
Payments made during period	(3.9)	(2.4)	(4.0)	(4.6)
Balance at end of period	9.0	4.9	3.4	3.2	9.0	3.4
Contract Termination and Other Exit Costs
Restructuring Reserve [Rollforward]
Balance at beginning of period	5.9	7.1	3.1	4.5	7.1	4.5
Charge taken during the period	0.3	(0.3)	0.4	0.0
Payments made during period	(1.0)	(0.9)	(0.5)	(1.4)
Balance at end of period	$ 5.2	$ 5.9	$ 3.0	$ 3.1	$ 5.2	$ 3.0

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