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Contingent Acquisition Obligations (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Deferred acquisition payments  
Business Acquisition, Contingent Consideration [Line Items]  
Future contingent acquisition obligation due in 2018 $ 47.9
Future contingent acquisition obligation due in 2019 10.9
Future contingent acquisition obligation due in 2020 7.0
Future contingent acquisition obligation due in 2021 8.4
Future contingent acquisition obligation due in 2022 0.0
Future contingent acquisition obligation due thereafter 2.9
Future contingent acquisition obligation due, total 77.1
Redeemable noncontrolling interests and call options with affiliates  
Business Acquisition, Contingent Consideration [Line Items]  
Future contingent acquisition obligation due in 2018 17.2
Future contingent acquisition obligation due in 2019 23.3
Future contingent acquisition obligation due in 2020 26.8
Future contingent acquisition obligation due in 2021 1.5
Future contingent acquisition obligation due in 2022 0.7
Future contingent acquisition obligation due thereafter 0.0
Future contingent acquisition obligation due, total 69.5
Redeemable at noncontrolling equity owners discretion  
Business Acquisition, Contingent Consideration [Line Items]  
Future contingent acquisition obligation due in 2018 14.2
Total contingent acquisition payments  
Business Acquisition, Contingent Consideration [Line Items]  
Future contingent acquisition obligation due in 2018 65.1
Future contingent acquisition obligation due in 2019 34.2
Future contingent acquisition obligation due in 2020 33.8
Future contingent acquisition obligation due in 2021 9.9
Future contingent acquisition obligation due in 2022 0.7
Future contingent acquisition obligation due thereafter 2.9
Future contingent acquisition obligation due, total $ 146.6