Other Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Actual and Estimated Amortization Expense [Line Items]
Amortization expense	$ 82.7	$ 63.3	$ 53.1
Estimated amortization expense, 2013	84.7
Estimated amortization expense, 2014	83.7
Estimated amortization expense, 2015	81.1
Estimated amortization expense, 2016	77.6
Estimated amortization expense, 2017	$ 76.3