Components of Property, Plant and Equipment (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Land	$ 25.6	$ 25.6
Buildings and improvements	224.9	224.5
Machinery and equipment	506.6	479.4
Office equipment and other assets	45.1	32.0
Software	95.6	91.4
Construction in progress	63.2	57.6
Gross Property, Plant and Equipment	961.0	910.5
Less accumulated depreciation and amortization	428.2	404.5
Net Property, Plant and Equipment	$ 532.8	$ 506.0