Restructuring (Restructuring Liability) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restructuring Liability [Roll Forward]
Utilization	$ (10.4)	$ 16.9	$ (32.3)
2022 Repositioning
Restructuring Liability [Roll Forward]
Utilization	(14.4)	0.0	0.0
2020 Repositioning
Restructuring Liability [Roll Forward]
Utilization	0.0	3.7	(32.1)
2019 Repositioning
Restructuring Liability [Roll Forward]
Utilization	4.0	(0.1)	(6.1)
2017 Repositioning
Restructuring Liability [Roll Forward]
Utilization	0.0	13.3	6.2
Severance
Restructuring Liability [Roll Forward]
Beginning balance	12.2	24.9
Expense (Gain)	13.2	0.1
Adjustment	0.0	(1.4)
Utilization	(8.8)	(11.4)
Ending balance	16.6	12.2	24.9
Severance | 2022 Repositioning
Restructuring Liability [Roll Forward]
Beginning balance	0.0	0.0
Expense (Gain)	14.4	0.0
Adjustment	0.0	0.0
Utilization	(0.2)	0.0
Ending balance	14.2	0.0	0.0
Severance | 2020 Repositioning
Restructuring Liability [Roll Forward]
Beginning balance	0.0	4.2
Expense (Gain)	0.0	0.0
Adjustment	0.0	(0.9)
Utilization	0.0	(3.3)
Ending balance	0.0	0.0	4.2
Severance | 2019 Repositioning
Restructuring Liability [Roll Forward]
Beginning balance	11.5	16.0
Expense (Gain)	(1.2)	0.1
Adjustment	0.0	0.0
Utilization	(7.9)	(4.6)
Ending balance	2.4	11.5	16.0
Severance | 2017 Repositioning
Restructuring Liability [Roll Forward]
Beginning balance	0.7	4.7
Expense (Gain)	0.0	0.0
Adjustment	0.0	(0.5)
Utilization	(0.7)	(3.5)
Ending balance	$ 0.0	$ 0.7	$ 4.7