Share-Based Compensation - Share-based Compensation Expense (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Total expense, pre-tax	$ 48.5	$ 55.0	$ 60.5
Tax benefit related to awards	(15.6)	(16.6)	(17.8)
Total expense, net of tax	32.9	38.4	42.7
Stock options [Member]
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Total expense, pre-tax	24.7	32.4	41.7
RSUs and other [Member]
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Total expense, pre-tax	$ 23.8	$ 22.6	$ 18.8