Goodwill and Other Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Intangible assets:
Gross Carrying Amount, intangible assets subject to amortization	$ 178.4		$ 178.4		$ 163.6
Accumulated Amortization, intangible assets subject to amortization	(45.7)		(45.7)		(35.2)
Net Carrying Amount, intangible assets subject to amortization	132.7		132.7		128.4
Gross Carrying Amount, total intangible assets	184.2		184.2		171.6
Net Carrying Amount, total intangible assets	138.5		138.5		136.4
Amortization expense related to intangible assets subject to amortization	5.6	4.2	10.7	8.1
Existing technology and related patents
Intangible assets:
Gross Carrying Amount, intangible assets subject to amortization	150.3		150.3		141.4
Accumulated Amortization, intangible assets subject to amortization	(39.0)		(39.0)		(29.9)
Net Carrying Amount, intangible assets subject to amortization	111.3		111.3		111.5
Customer relationships
Intangible assets:
Gross Carrying Amount, intangible assets subject to amortization	27.9		27.9		22.0
Accumulated Amortization, intangible assets subject to amortization	(6.5)		(6.5)		(5.1)
Net Carrying Amount, intangible assets subject to amortization	21.4		21.4		16.9
Trade names
Intangible assets:
Gross Carrying Amount, intangible assets subject to amortization	0.2		0.2		0.2
Accumulated Amortization, intangible assets subject to amortization	(0.2)		(0.2)		(0.2)
In-process research and development
Intangible assets:
Gross Carrying Amount, intangible assets not subject to amortization	5.8		5.8		8.0
Net Carrying Amount, total intangible assets	$ 5.8		$ 5.8		$ 8.0