Restructuring (Restructuring Liability) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Restructuring Reserve [Roll Forward]
Utilization	$ 0.0	$ 13.1
2019 Repositioning Actions
Restructuring Reserve [Roll Forward]
Utilization	0.0	(0.1)
2017 Repositioning Actions
Restructuring Reserve [Roll Forward]
Utilization	0.0	$ 12.7
Severance
Restructuring Reserve [Roll Forward]
Beginning balance	12.2
Utilization	(5.0)
Ending balance	7.2
Severance | 2019 Repositioning Actions
Restructuring Reserve [Roll Forward]
Beginning balance	11.5
Utilization	(4.4)
Ending balance	7.1
Severance | 2017 Repositioning Actions
Restructuring Reserve [Roll Forward]
Beginning balance	0.7
Utilization	(0.6)
Ending balance	$ 0.1