Components of Inventories (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Inventory [Line Items]
Raw materials	$ 293.7	$ 287.7
Work in progress	225.1	225.9
Finished products	178.2	180.9
Inventories	697.0	694.5
Inventory valuation reserve	(83.5)	(83.5)
Total inventories, net of reserve	$ 613.5	$ 611.0