Contingent Acquisition Obligations (Details) $ in Millions	Dec. 31, 2016 USD ($)
Deferred acquisition payments
Business Acquisition, Contingent Consideration [Line Items]
Future Contingent Acquisition Obligation Due in 2017	$ 76.9
Future Contingent Acquisition Obligation Due in 2018	31.6
Future Contingent Acquisition Obligation Due in 2019	25.1
Future Contingent Acquisition Obligation Due in 2020	8.9
Future Contingent Acquisition Obligation Due in 2021	26.9
Future Contingent Acquisition Obligation Due Thereafter	11.4
Future Contingent Acquisition Obligation Due, Total	180.8
Redeemable noncontrolling interests and call options with affiliates
Business Acquisition, Contingent Consideration [Line Items]
Future Contingent Acquisition Obligation Due in 2017	34.7	[1]
Future Contingent Acquisition Obligation Due in 2018	76.5	[1]
Future Contingent Acquisition Obligation Due in 2019	32.9	[1]
Future Contingent Acquisition Obligation Due in 2020	3.9	[1]
Future Contingent Acquisition Obligation Due in 2021	3.1	[1]
Future Contingent Acquisition Obligation Due Thereafter	4.2	[1]
Future Contingent Acquisition Obligation Due, Total	155.3	[1]
Redeemable at noncontrolling equity owners discretion
Business Acquisition, Contingent Consideration [Line Items]
Future Contingent Acquisition Obligation Due in 2017	25.9
Total contingent acquisition payments
Business Acquisition, Contingent Consideration [Line Items]
Future Contingent Acquisition Obligation Due in 2017	111.6
Future Contingent Acquisition Obligation Due in 2018	108.1
Future Contingent Acquisition Obligation Due in 2019	58.0
Future Contingent Acquisition Obligation Due in 2020	12.8
Future Contingent Acquisition Obligation Due in 2021	30.0
Future Contingent Acquisition Obligation Due Thereafter	15.6
Future Contingent Acquisition Obligation Due, Total	$ 336.1

[1] We have entered into certain acquisitions that contain both redeemable noncontrolling interests and call options with similar terms and conditions. The estimated amounts listed would be paid in the event of exercise at the earliest exercise date. We have certain redeemable noncontrolling interests that are exercisable at the discretion of the noncontrolling equity owners as of December 31, 2016. These estimated payments of $25.9 are included within the total payments expected to be made in 2017, and will continue to be carried forward into 2018 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.