Share-Based Compensation Plans - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Expense	$ 23.1	$ 20.5
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted	386,749
Stock granted, total grant-date fair value	6.3
Share-Based Compensation Expense	6.4	6.9
Stock Options | Retirement Eligible Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Expense	3.0	2.1
Restricted Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock granted, total grant-date fair value	60.8
Stock unit awards granted	999,862
Share-Based Compensation Expense	14.1	12.4
Restricted Stock Unit Awards | Fully Vested Restricted Stock Unit Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Expense	1.4	1.5
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock granted, total grant-date fair value	15.2
Stock unit awards granted	249,618
Share-Based Compensation Expense	$ 2.6	$ 1.2