Valuation and Qualifying Accounts (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance At Beginning Of Period	$ 8.2	$ 7.4	$ 7.4
Expenses	4.8	1.9	3.0
Other	1.0		0.6
Write- Offs/ Disposals	1.9	1.1	3.6
Balance At End Of Period	12.1	8.2	7.4
Reserve for Obsolete Inventories
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance At Beginning Of Period	49.8	45.3	33.5
Expenses	20.7	15.9	24.7
Write- Offs/ Disposals	7.0	11.4	12.9
Balance At End Of Period	63.5	49.8	45.3
Deferred tax asset valuation allowance
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance At Beginning Of Period	20.1	14.4	10.5
Other	6.4	5.7	3.9
Balance At End Of Period	$ 26.5	$ 20.1	$ 14.4