Restructuring Charges 2020 Plan Restructuring Activity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Severance and termination costs	$ 0.1	$ 0.0	$ 0.4	$ 0.3
Lease impairment costs	(2.4)	0.0	(1.2)	5.3
Other restructuring costs	0.6	(0.1)	0.7	0.9
Restructuring charges	(1.7)	$ (0.1)	(0.1)	$ 6.5
Restructuring Reserve					$ 2.3
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1.1		1.1		2.3
Lease impairment costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0.0		0.0		0.0
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 0.0		0.0		$ 0.0
Non-cash Items [Member]
Restructuring Cost and Reserve [Line Items]
Severance and termination costs			0.0
Lease impairment costs			(0.5)
Restructuring charges			(0.5)
Cash Payments [Member]
Restructuring Cost and Reserve [Line Items]
Severance and termination costs			1.6
Lease impairment costs			0.0
Restructuring charges			$ 1.6