Goodwill and Other Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Intangible assets:
Gross Carrying Amount, intangible assets subject to amortization	$ 180.2		$ 163.6
Accumulated Amortization, intangible assets subject to amortization	(38.9)		(35.2)
Net Carrying Amount, intangible assets subject to amortization	141.3		128.4
Gross Carrying Amount, total intangible assets	186.0		171.6
Net Carrying Amount, total intangible assets	147.1		136.4
Amortization expense related to intangible assets subject to amortization	5.1	3.9
Existing technology and related patents
Intangible assets:
Gross Carrying Amount, intangible assets subject to amortization	151.3		141.4
Accumulated Amortization, intangible assets subject to amortization	(32.9)		(29.9)
Net Carrying Amount, intangible assets subject to amortization	118.4		111.5
Customer relationships
Intangible assets:
Gross Carrying Amount, intangible assets subject to amortization	28.7		22.0
Accumulated Amortization, intangible assets subject to amortization	(5.8)		(5.1)
Net Carrying Amount, intangible assets subject to amortization	22.9		16.9
Trade names
Intangible assets:
Gross Carrying Amount, intangible assets subject to amortization	0.2		0.2
Accumulated Amortization, intangible assets subject to amortization	(0.2)		(0.2)
In-process research and development
Intangible assets:
Gross Carrying Amount, intangible assets not subject to amortization	5.8		8.0
Net Carrying Amount, total intangible assets	$ 5.8		$ 8.0