Restructuring (Restructuring Liability) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Restructuring Reserve [Roll Forward]
Utilization	$ 0.0	$ 0.2	$ 0.0	$ 13.3
2019 Repositioning
Restructuring Reserve [Roll Forward]
Utilization			0.0	(0.1)
2017 Repositioning
Restructuring Reserve [Roll Forward]
Utilization	(0.0)	$ 0.2	0.0	$ 12.9
Severance
Restructuring Reserve [Roll Forward]
Beginning balance			12.2
Utilization			(6.7)
Ending balance	5.5		5.5
Severance | 2019 Repositioning
Restructuring Reserve [Roll Forward]
Beginning balance			11.5
Utilization			(6.1)
Ending balance	5.4		5.4
Severance | 2017 Repositioning
Restructuring Reserve [Roll Forward]
Beginning balance			0.7
Utilization			(0.6)
Ending balance	$ 0.1		$ 0.1