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Contingent Acquisition Obligations (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Deferred acquisition payments  
Business Acquisition, Contingent Consideration [Line Items]  
Future contingent acquisition obligation due in 2018 $ 2.9
Future contingent acquisition obligation due in 2019 0.1
Future contingent acquisition obligation due in 2020 0.1
Future contingent acquisition obligation due in 2021 0.0
Future contingent acquisition obligation due in 2022 0.0
Future contingent acquisition obligation due thereafter 0.0
Future contingent acquisition obligation due, total 3.1
Redeemable noncontrolling interests and call options with affiliates  
Business Acquisition, Contingent Consideration [Line Items]  
Future contingent acquisition obligation due in 2018 9.7
Future contingent acquisition obligation due in 2019 17.4
Future contingent acquisition obligation due in 2020 19.9
Future contingent acquisition obligation due in 2021 28.7
Future contingent acquisition obligation due in 2022 0.0
Future contingent acquisition obligation due thereafter 0.0
Future contingent acquisition obligation due, total 75.7
Redeemable at noncontrolling equity owners discretion  
Business Acquisition, Contingent Consideration [Line Items]  
Future contingent acquisition obligation due in 2018 1.4
Total contingent acquisition payments  
Business Acquisition, Contingent Consideration [Line Items]  
Future contingent acquisition obligation due in 2018 12.6
Future contingent acquisition obligation due in 2019 17.5
Future contingent acquisition obligation due in 2020 20.0
Future contingent acquisition obligation due in 2021 28.7
Future contingent acquisition obligation due in 2022 0.0
Future contingent acquisition obligation due thereafter 0.0
Future contingent acquisition obligation due, total $ 78.8