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Investments - Schedule of Investments in Unconsolidated Affiliates (Details) - USD ($)
$ in Millions
Apr. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]      
Investments in unconsolidated affiliates   $ 906.3 $ 397.2
Ceridian      
Schedule of Equity Method Investments [Line Items]      
Ownership (as a percent)   23.30%  
Investments in unconsolidated affiliates   $ 392.6 359.7
Dun And Bradstreet Corporation      
Schedule of Equity Method Investments [Line Items]      
Investments in unconsolidated affiliates   478.2 0.0
Other      
Schedule of Equity Method Investments [Line Items]      
Investments in unconsolidated affiliates   $ 35.5 $ 37.5
Ceridian | Ceridian      
Schedule of Equity Method Investments [Line Items]      
Ownership (as a percent)   23.30%  
Dun And Bradstreet Corporation | Dun And Bradstreet Corporation      
Schedule of Equity Method Investments [Line Items]      
Ownership (as a percent) 24.30%