Restructuring (Narrative) (Details) $ in Millions	3 Months Ended					6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 employee	Dec. 31, 2019 employee	Dec. 31, 2017 employee	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring (gains) charges, net	$ 0.0	$ (0.2)				$ 0.0	$ (13.3)
2020 Repositioning Actions
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected number of positions eliminated | employee			1,200
Restructuring and related cost, number of positions eliminated, period percent			11.00%
Restructuring (gains) charges, net						0.0	(0.5)
2019 Repositioning
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected number of positions eliminated | employee				180
Restructuring and related cost, number of positions eliminated, period percent				1.00%
Restructuring (gains) charges, net						0.0	0.1
2017 Repositioning
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected number of positions eliminated | employee					300
Restructuring and related cost, number of positions eliminated, period percent					3.00%
Restructuring (gains) charges, net	$ 0.0	$ (0.2)				$ 0.0	$ (12.9)