Fair Value Of Financial Instruments (Schedule Of Fair Values Of Financial Assets And Liabilities Measured On A Recurring Basis) (Detail) (Fair Value [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount, life insurance policies	$ 5.0		$ 11.9
Earn-out Arrangements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration	169.8	[1]	143.6	[1]
Auction Rate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Auction rate securities (See Note 7)	9.2		14.4
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying amount, life insurance policies	5.0		11.9
Level 3 [Member] | Earn-out Arrangements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration	169.8	[1]	143.6	[1]
Level 3 [Member] | Auction Rate Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Auction rate securities (See Note 7)	$ 9.2		$ 14.4

[1] For acquisitions that closed after January 1, 2009.