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Commitments and Contingencies - Other commitments (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Apr. 30, 2019
Dec. 31, 2018
Apr. 30, 2017
Line of Credit Facility [Line Items]        
Investment commitments $ 1,690.0   $ 1,770.0  
Estimated purchase commitments, primarily related to software and computerized systems 55.6   $ 39.5  
CMG Mortgage Insurance Company        
Line of Credit Facility [Line Items]        
Contingent consideration liability $ 6.7 $ 61.5   $ 71.7