Cash Paid for Acquisitions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Business Acquisitions
Total cash paid for acquisitions	$ 89.1	[1]	$ 182.6	[1]	$ 134.6	[1]
Less: net cash acquired	(7.1)		(14.8)		(18.5)
Operating expense	2.0	[2]	3.2	[2]	0.5	[2]
Acquisition-related payments	(27.6)		(37.1)		(71.5)
Acquisitions, including deferred payments, net of cash acquired	(61.5)		(145.5)		(63.1)
PaymentsToAcquireBusinessesGrossLessOperatingExpense s	91.1		185.8		135.1
Cost of investment: current-year acquisitions
Business Acquisitions
Total cash paid for acquisitions	67.7		156.8		48.0
Cost of investment: prior-year acquisitions
Business Acquisitions
Total cash paid for acquisitions	$ 28.5		$ 40.6		$ 105.1

[1] Of the total cash paid, $27.6, $37.1 and $71.5 for the years ended December 31, 2013, 2012 and 2011, respectively, are classified under the financing section of the Consolidated Statements of Cash Flows within acquisition-related payments. These amounts relate to increases in our ownership interests in our consolidated subsidiaries as well as deferred payments for acquisitions that closed on or after January 1, 2009. Of the total cash paid, $61.5, $145.5 and $63.1 for the years ended December 31, 2013, 2012 and 2011, respectively, are classified under the investing section of the Consolidated Statements of Cash Flows within acquisitions, including deferred payments, net of cash acquired. These amounts relate to initial payments for new transactions and deferred payments for acquisitions that closed prior to January 1, 2009.

[2] Represents cash payments made that were either in excess of the contractual value or contingent upon the future employment of the former owners of acquired companies.