Acquisitions Cash Paid for Acquisitions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Business Acquisition [Line Items]
Acquisition related payments	$ 13.6		$ 27.6		$ 37.1
Payments to Acquire Businesses, Net of Cash Acquired	67.8		61.5		145.5
Cash Acquired from Acquisition	(29.9)		(7.1)		(14.8)
PaymentsToAcquireBusinessesGrossLessOperatingExpense s	84.8		91.1		185.8
Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized	3.4	[1]	2.0	[1]	3.2	[1]
Payments to Acquire Businesses, Gross	81.4	[2]	89.1	[2]	182.6	[2]
Current Year Acquisition [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	97.3		67.7		156.8
Prior Year Acquisition [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 14.0		$ 28.5		$ 40.6

[1] Of the total cash paid, $13.6, $27.6 and $37.1 for the years ended December 31, 2014, 2013 and 2012, 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. Of the total cash paid, $67.8, $61.5 and $145.5 for the years ended December 31, 2014, 2013 and 2012, respectively, are classified under the investing section of the Consolidated Statements of Cash Flows within acquisitions, net of cash acquired. These amounts relate to initial payments for new transactions.

[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