Changes in Level 3 Liabilities (Detail) (Contingent Consideration, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Liabilities Beginning Balance	$ 52.7		$ 55.4		$ 50.1
Total (Gains) and Losses:
Included in Earnings	1.3	[1]	(0.1)	[1]	3.9	[1]
Purchases, Issues, Sales, and Settlements
Settlements			(55.3)
Fair Value Liabilities Ending Balance	54.0				54.0
Unrealized (Gains) Losses Included in Earnings Related to Financial Instruments Held at June 30	$ 1.3	[1]			$ 3.9	[1]

[1] (Gains) losses are recorded in other operating income (expense) within the consolidated statement of income.