Goodwill and Other Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Intangible assets:
Gross Carrying Amount, intangible assets subject to amortization	$ 179.2		$ 179.2		$ 163.6
Accumulated Amortization, intangible assets subject to amortization	(51.1)		(51.1)		(35.2)
Net Carrying Amount, intangible assets subject to amortization	128.1		128.1		128.4
Gross Carrying Amount, total intangible assets	184.9		184.9		171.6
Net Carrying Amount, total intangible assets	133.8		133.8		136.4
Amortization expense related to intangible assets subject to amortization	5.5	5.0	16.2	13.1
Existing technology and related patents
Intangible assets:
Gross Carrying Amount, intangible assets subject to amortization	150.8		150.8		141.4
Accumulated Amortization, intangible assets subject to amortization	(43.6)		(43.6)		(29.9)
Net Carrying Amount, intangible assets subject to amortization	107.2		107.2		111.5
Customer relationships
Intangible assets:
Gross Carrying Amount, intangible assets subject to amortization	28.2		28.2		22.0
Accumulated Amortization, intangible assets subject to amortization	(7.3)		(7.3)		(5.1)
Net Carrying Amount, intangible assets subject to amortization	20.9		20.9		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	5.7		5.7		8.0
Net Carrying Amount, total intangible assets	$ 5.7		$ 5.7		$ 8.0