Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	$ 274.9		$ 274.9		$ 236.0
Accumulated Amortization, intangible assets subject to amortization	(176.8)		(176.8)		(154.2)
Net Carrying Amount, intangible assets subject to amortization	98.1		98.1		81.8
Gross Carrying Amount, total intangible assets	275.5		275.5		236.6
Net Carrying Amount, total intangible assets	98.7		98.7		82.4
Amortization expense related to intangible assets subject to amortization	6.9	$ 8.2	21.5	$ 22.6
In-process research and development
Intangible assets
Gross Carrying Amount, intangible assets not subject to amortization	0.6		0.6		0.6
Net Carrying Amount, intangible assets not subject to amortization	0.6		0.6		0.6
Existing technology and related patents
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	215.3		215.3		195.4
Accumulated Amortization, intangible assets subject to amortization	(156.0)		(156.0)		(138.9)
Net Carrying Amount, intangible assets subject to amortization	59.3		59.3		56.5
Customer relationships
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	49.6		49.6		34.6
Accumulated Amortization, intangible assets subject to amortization	(16.2)		(16.2)		(12.9)
Net Carrying Amount, intangible assets subject to amortization	33.4		33.4		21.7
Non compete contracts
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	1.8		1.8		1.8
Accumulated Amortization, intangible assets subject to amortization	(1.8)		(1.8)		(1.5)
Net Carrying Amount, intangible assets subject to amortization					0.3
Trade names
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	5.4		5.4		4.2
Accumulated Amortization, intangible assets subject to amortization	(1.4)		(1.4)		(0.9)
Net Carrying Amount, intangible assets subject to amortization	4.0		4.0		$ 3.3
Other
Intangible assets
Gross Carrying Amount, intangible assets subject to amortization	2.8		2.8
Accumulated Amortization, intangible assets subject to amortization	(1.4)		(1.4)
Net Carrying Amount, intangible assets subject to amortization	$ 1.4		$ 1.4