Goodwill And Other Acquisition Intangibles (Other Acquisition Intangibles) (Details) (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 48.0	$ 46.9
Net Carrying Value	11.6	12.2
Accumulated Amortization	(36.4)	(34.7)
Technology-Based
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (years)	13 years 10 months 24 days
Gross Carrying Value	24.1	23.0
Net Carrying Value	5.5	5.3
Accumulated Amortization	(18.6)	(17.7)
Marketing Related
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (years)	14 years
Gross Carrying Value	5.0	5.0
Net Carrying Value	0.6	0.7
Accumulated Amortization	(4.4)	(4.3)
Customer-Related
Finite-Lived Intangible Assets [Line Items]
Weighted Average Useful Life (years)	14 years 2 months 12 days
Gross Carrying Value	18.9	18.9
Net Carrying Value	5.5	6.2
Accumulated Amortization	$ (13.4)	$ (12.7)