Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	$ 480.4		$ 480.4		$ 473.6
Accumulated Amortization, intangible assets subject to amortization	(262.7)		(262.7)		(244.5)
Net Carrying Amount, intangible assets subject to amortization	217.7		217.7		229.1
Amortization expense related to intangible assets subject to amortization	9.3	$ 9.0	27.3	$ 26.7
Technology
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	308.4		308.4		309.8
Accumulated Amortization, intangible assets subject to amortization	(202.1)		(202.1)		(194.6)
Net Carrying Amount, intangible assets subject to amortization	106.3		106.3		115.2
Customer relationships
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	155.1		155.1		148.3
Accumulated Amortization, intangible assets subject to amortization	(54.6)		(54.6)		(45.4)
Net Carrying Amount, intangible assets subject to amortization	100.5		100.5		102.9
Trade name
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	15.1		15.1		15.2
Accumulated Amortization, intangible assets subject to amortization	(5.4)		(5.4)		(4.4)
Net Carrying Amount, intangible assets subject to amortization	9.7		9.7		10.8
Other
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	1.8		1.8		0.3
Accumulated Amortization, intangible assets subject to amortization	(0.6)		(0.6)		(0.1)
Net Carrying Amount, intangible assets subject to amortization	$ 1.2		$ 1.2		$ 0.2