Restructuring (Restructuring Liability) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Utilization	$ (23.8)	$ (1.6)	$ (22.6)	$ (4.5)
2020 Repositioning Actions
Restructuring Cost and Reserve [Line Items]
Utilization	(24.8)	0.0	(24.8)	0.0
2017 Repositioning Actions
Restructuring Cost and Reserve [Line Items]
Utilization	1.0	$ (1.0)	2.5	$ (1.7)
Severance
Restructuring Cost and Reserve [Line Items]
Beginning balance			22.4
Expense (Gain)			15.1
Utilization			(23.1)
Ending balance	30.4		30.4
Severance | 2020 Repositioning Actions
Restructuring Cost and Reserve [Line Items]
Beginning balance			0.0
Expense (Gain)			13.1
Utilization			23.8
Ending balance	10.7		10.7
Severance | 2019 Repositioning Actions
Restructuring Cost and Reserve [Line Items]
Beginning balance			9.9
Expense (Gain)			0.1
Ending balance	9.8		9.8
Severance | 2017 Repositioning Actions
Restructuring Cost and Reserve [Line Items]
Beginning balance			12.5
Expense (Gain)			1.6
Utilization			1.0
Ending balance	9.9		9.9
Severance | Other Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Beginning balance			0.0
Expense (Gain)			0.3
Utilization			(0.3)
Ending balance	0.0		0.0
Other Restructuring Costs
Restructuring Cost and Reserve [Line Items]
Beginning balance			0.2
Expense (Gain)			(0.3)
Utilization			0.5
Ending balance	0.0		0.0
Other Restructuring Costs | 2020 Repositioning Actions
Restructuring Cost and Reserve [Line Items]
Beginning balance			0.0
Expense (Gain)			1.0
Utilization			(1.0)
Ending balance	0.0		0.0
Other Restructuring Costs | 2019 Repositioning Actions
Restructuring Cost and Reserve [Line Items]
Beginning balance			0.0
Expense (Gain)			0.0
Utilization			0.0
Ending balance	0.0		0.0
Other Restructuring Costs | 2017 Repositioning Actions
Restructuring Cost and Reserve [Line Items]
Beginning balance			0.2
Expense (Gain)			(1.3)
Utilization			1.5
Ending balance	0.0		0.0
Other Restructuring Costs | Other Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Beginning balance			0.0
Utilization			0.0
Ending balance	$ 0.0		$ 0.0