Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	$ 461.4		$ 461.4		$ 473.6
Accumulated Amortization, intangible assets subject to amortization	(255.5)		(255.5)		(244.5)
Net Carrying Amount, intangible assets subject to amortization	205.9		205.9		229.1
Amortization expense related to intangible assets subject to amortization	9.1	$ 9.0	18.0	$ 17.7
Technology
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	300.9		300.9		309.8
Accumulated Amortization, intangible assets subject to amortization	(198.4)		(198.4)		(194.6)
Net Carrying Amount, intangible assets subject to amortization	102.5		102.5		115.2
Customer relationships
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	145.3		145.3		148.3
Accumulated Amortization, intangible assets subject to amortization	(51.8)		(51.8)		(45.4)
Net Carrying Amount, intangible assets subject to amortization	93.5		93.5		102.9
Trade name
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	14.9		14.9		15.2
Accumulated Amortization, intangible assets subject to amortization	(5.1)		(5.1)		(4.4)
Net Carrying Amount, intangible assets subject to amortization	9.8		9.8		10.8
Other
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	0.3		0.3		0.3
Accumulated Amortization, intangible assets subject to amortization	(0.2)		(0.2)		(0.1)
Net Carrying Amount, intangible assets subject to amortization	$ 0.1		$ 0.1		$ 0.2