Goodwill and Other Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Goodwill.
Balance at beginning of period			$ 98.3
Measurement period adjustments			(2.0)
Foreign currency impact			0.1
Balance at end of period	96.4		96.4
Intangible assets:
Gross Carrying Amount, intangible assets	151.4		151.4		132.6
Accumulated Amortization, intangible assets	(26.2)		(26.2)		(17.8)
Net Carrying Amount, intangible assets	125.2		125.2		114.8
Gross Carrying Amount, total intangible assets	159.3		159.3		153.9
Net Carrying Amount, total intangible assets	133.1		133.1		136.1
Amortization expense related to intangible assets subject to amortization	5.0	1.0	13.1	2.1
Existing technology and related patents
Intangible assets:
Gross Carrying Amount, intangible assets	129.4		129.4		112.0
Accumulated Amortization, intangible assets	(21.5)		(21.5)		(15.0)
Net Carrying Amount, intangible assets	107.9		107.9		97.0
Estimated useful lives, minimum (in years)			3
Estimated useful lives, maximum (in years)			10
Customer Relationships
Intangible assets:
Gross Carrying Amount, intangible assets	21.5		21.5		20.2
Accumulated Amortization, intangible assets	(4.4)		(4.4)		(2.5)
Net Carrying Amount, intangible assets	17.1		17.1		17.7
Estimated useful lives, minimum (in years)			5
Estimated useful lives, maximum (in years)			10
Trade names
Intangible assets:
Gross Carrying Amount, intangible assets	0.5		0.5		0.4
Accumulated Amortization, intangible assets	(0.3)		(0.3)		(0.3)
Net Carrying Amount, intangible assets	0.2		0.2		0.1
Estimated useful lives, minimum (in years)			5
Estimated useful lives, maximum (in years)			10
In-process research and development
Intangible assets:
Gross Carrying Amount, intangible assets not subject to amortization	7.9		7.9		21.3
Net Carrying Amount, total intangible assets	$ 7.9		$ 7.9		$ 21.3