Summary of Activity for Both Allowances (Detail) (USD $) In Millions, unless otherwise specified					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 Accounts receivable allowance	Dec. 31, 2012 Accounts receivable allowance	Dec. 31, 2011 Accounts receivable allowance	Dec. 31, 2013 Deferred tax assets - valuation allowance	Dec. 31, 2012 Deferred tax assets - valuation allowance	Dec. 31, 2011 Deferred tax assets - valuation allowance
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of the Year accounts receivable allowance	$ 28.9	$ 29.1	$ (28.0)	$ (33.0)
Additions					(44.5)	(44.3)	(40.6)	(0.1)	(3.1)	(4.0)
Write-offs and Adjustments					(44.7)	(43.2)	(45.6)	(6.9)	(1.8)	(2.9)
Balance at End of the Year accounts receivable allowance	28.9	29.1	(28.0)	(33.0)
Balance at beginning of the year DTA valuation allowance	8.4	15.2	(13.9)	(12.8)
Balance at end of the year DTA valuation allowance	$ 8.4	$ 15.2	$ (13.9)	$ (12.8)