Other Expense (Income) - Restructuring and Related Charges (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
	Jul. 31, 2020	Feb. 28, 2018	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Reserve [Roll Forward]
Charges			$ 0.4	$ 4.5	$ 2.5	$ 4.5
2020 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related activities, period of implementation	24 months
Restructuring and related cost, cumulative cost incurred	$ 7.1
Restructuring Reserve [Roll Forward]
Balance, December 31, 2020					4.6
Charges					2.5
Cash payments					(2.3)
Balance, September 30, 2021			4.8		4.8
2020 Restructuring Plan | Severance and benefits
Restructuring Reserve [Roll Forward]
Balance, December 31, 2020					4.6
Charges					1.0
Cash payments					(1.4)
Balance, September 30, 2021			4.2		4.2
2020 Restructuring Plan | Other charges
Restructuring Reserve [Roll Forward]
Balance, December 31, 2020					0.0
Charges					1.5
Cash payments					(0.9)
Balance, September 30, 2021			0.6		0.6
2020 Restructuring Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	15.0		9.0		9.0
Effect on future earnings, amount	3.5		0.9
2020 Restructuring Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	17.0		11.0		11.0
Effect on future earnings, amount	$ 4.5		1.6
2018 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and related activities, period of implementation		24 months
Restructuring and related cost, expected cost		$ 16.0
Restructuring and related cost, cumulative cost incurred			13.7		13.7
Restructuring Reserve [Roll Forward]
Balance, December 31, 2020					0.1
Cash payments					(0.1)
Balance, September 30, 2021			0.0		0.0
2018 Restructuring Plan | Severance and benefits
Restructuring Reserve [Roll Forward]
Balance, December 31, 2020					0.1
Cash payments					(0.1)
Balance, September 30, 2021			$ 0.0		$ 0.0