Restructuring Charges 2020 Plan Restructuring Activity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Restructuring Cost and Reserve [Line Items]
Severance and termination costs	$ 0.3	$ 1.5
Lease impairment costs	5.3	(0.4)
Other restructuring costs	1.0	0.2
Restructuring charges	6.6	$ 1.3
Restructuring Reserve	4.9		$ 9.4
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	4.9		9.4
Lease impairment costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0.0		0.0
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0.0		$ 0.0
Non-cash Items [Member]
Restructuring Cost and Reserve [Line Items]
Severance and termination costs	0.0
Lease impairment costs	5.3
Other restructuring costs	1.0
Restructuring charges	6.3
Cash Payments [Member]
Restructuring Cost and Reserve [Line Items]
Severance and termination costs	4.8
Lease impairment costs	0.0
Other restructuring costs	0.0
Restructuring charges	$ 4.8