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Equity Method Investments in Affiliates - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]            
Amortization expense during the period $ 30.1   $ 21.2 $ 76.5 $ 65.1  
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Carrying value of equity method investment in affiliate 3,055.3     3,055.3   $ 3,304.7
Acquired Client Relationships            
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Finite-lived intangible, future amortization expense in 2018 100.0     100.0    
Finite-lived intangible, future amortization expense in 2019 90.0     90.0    
Finite-lived intangible, future amortization expense in 2020 60.0     60.0    
Finite-lived intangible, future amortization expense in 2021 35.0     35.0    
Finite-lived intangible, future amortization expense in 2022 35.0     35.0    
Equity Method Investee            
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Carrying value of equity method investment in affiliate 3,055.3     3,055.3   $ 3,304.7
Equity Method Investee | Investment One            
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Impairment recognized on equity method investment in affiliate   $ 33.3        
Impairment recognized on equity method investment in affiliate, net of tax   25.0        
Carrying value of equity method investment in affiliate   $ 0.0        
Revenue from equity method investment in affiliate 283.2   301.8 884.9 826.6  
Net income from equity method investment in affiliate 135.0   178.3 443.3 471.3  
Equity Method Investee | Acquired Client Relationships            
Schedule of Equity Method Investments [Line Items]            
Amortization expense during the period 22.2   $ 25.9 109.0 $ 71.7  
Estimated Future Amortization Expense of Finite-Lived Intangibles            
Finite-lived intangible, future amortization expense in 2018 100.0     100.0    
Finite-lived intangible, future amortization expense in 2019 90.0     90.0    
Finite-lived intangible, future amortization expense in 2020 90.0     90.0    
Finite-lived intangible, future amortization expense in 2021 90.0     90.0    
Finite-lived intangible, future amortization expense in 2022 $ 90.0     $ 90.0