Contingent Acquisition Obligations (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Deferred acquisition payments
Business Acquisition, Contingent Consideration [Line Items]
Recorded Unconditional Purchase Obligation Due in Next Twelve Months	$ 10.2
Recorded Unconditional Purchase Obligation Due in Second Year	23.5
Recorded Unconditional Purchase Obligation Due in Third Year	18.9
Recorded Unconditional Purchase Obligation Due in Fourth Year	20.0
Recorded Unconditional Purchase Obligation Due in Fifth Year	5.9
Recorded Unconditional Purchase Obligation Due after Fifth Year	0.5
Recorded Unconditional Purchase Obligation	79.0
Redeemable noncontrolling interests and call options with affiliates
Business Acquisition, Contingent Consideration [Line Items]
Recorded Unconditional Purchase Obligation Due in Next Twelve Months	27.9
Recorded Unconditional Purchase Obligation Due in Second Year	59.8
Recorded Unconditional Purchase Obligation Due in Third Year	42.4
Recorded Unconditional Purchase Obligation Due in Fourth Year	5.1
Recorded Unconditional Purchase Obligation Due in Fifth Year	9.6
Recorded Unconditional Purchase Obligation Due after Fifth Year	15.3
Recorded Unconditional Purchase Obligation	160.1	[1]
Redeemable at noncontrolling equity owners discretion
Business Acquisition, Contingent Consideration [Line Items]
Recorded Unconditional Purchase Obligation Due in Next Twelve Months	23.8
Total contingent acquisition payments
Business Acquisition, Contingent Consideration [Line Items]
Recorded Unconditional Purchase Obligation Due in Next Twelve Months	38.1
Recorded Unconditional Purchase Obligation Due in Second Year	83.3
Recorded Unconditional Purchase Obligation Due in Third Year	61.3
Recorded Unconditional Purchase Obligation Due in Fourth Year	25.1
Recorded Unconditional Purchase Obligation Due in Fifth Year	15.5
Recorded Unconditional Purchase Obligation Due after Fifth Year	15.8
Recorded Unconditional Purchase Obligation	239.1
Cash compensation expense included in contingent acquisitions
Business Acquisition, Contingent Consideration [Line Items]
Recorded Unconditional Purchase Obligation Due in Next Twelve Months	0.4
Recorded Unconditional Purchase Obligation Due in Second Year	0.3
Recorded Unconditional Purchase Obligation Due in Third Year	0.3
Recorded Unconditional Purchase Obligation Due in Fourth Year	0.1
Recorded Unconditional Purchase Obligation Due in Fifth Year	0
Recorded Unconditional Purchase Obligation Due after Fifth Year	0
Recorded Unconditional Purchase Obligation	1.1
Total contingent acquisition payments excluding compensation expense
Business Acquisition, Contingent Consideration [Line Items]
Recorded Unconditional Purchase Obligation Due in Next Twelve Months	37.7
Recorded Unconditional Purchase Obligation Due in Second Year	83.0
Recorded Unconditional Purchase Obligation Due in Third Year	61.0
Recorded Unconditional Purchase Obligation Due in Fourth Year	25.0
Recorded Unconditional Purchase Obligation Due in Fifth Year	15.5
Recorded Unconditional Purchase Obligation Due after Fifth Year	15.8
Recorded Unconditional Purchase Obligation	$ 238.0

[1] We have entered into certain acquisitions that contain both redeemable noncontrolling interests and call options with similar terms and conditions. We have certain redeemable noncontrolling interests that are exercisable at the discretion of the noncontrolling equity owners as of December 31, 2013. These estimated payments of $23.8 are included within the total payments expected to be made in 2014, and will continue to be carried forward into 2015 or beyond until exercised or expired. Redeemable noncontrolling interests are included in the table at current exercise price payable in cash, not at applicable redemption value in accordance with the authoritative guidance for classification and measurement of redeemable securities.