Financial Instruments Carried at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, assets	$ 15.2	[1]	$ 12.6	[1]
Total, assets	15.2		12.6
Derivatives, liabilities	2.4	[1]	6.8	[1]
Contingent consideration arising from acquisitions, liabilities	9.0	[2]	9.1	[2]
Total, liabilities	11.4		15.9
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, assets	15.2	[1]	12.6	[1]
Total, assets	15.2		12.6
Derivatives, liabilities	2.4	[1]	6.8	[1]
Total, liabilities	2.4		6.8
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration arising from acquisitions, liabilities	9.0	[2]	9.1	[2]
Total, liabilities	$ 9.0		$ 9.1

[1] Represents interest rate swaps and FX forwards on certain assets and liabilities as well as on certain non U.S. dollar net investments in certain foreign subsidiaries more fully discussed in Note 5.

[2] Represents contingent consideration liabilities pursuant to the agreements for certain MA acquisitions which are more fully discussed in Note 7.