Components of Property, Plant and Equipment (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Land	$ 25.7	$ 25.6
Buildings and improvements	225.5	224.5
Machinery and equipment	526.1	479.4
Office equipment and other assets	47.3	32.0
Software	94.9	91.4
Construction in progress	63.3	57.6
Gross Property, Plant and Equipment	982.8	910.5
Less accumulated depreciation and amortization	440.4	404.5
Net Property, Plant and Equipment	$ 542.4	$ 506.0