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Investments - Schedule of Carrying Value and Unfunded Investment Commitments of Other Invested Assets Portfolio (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]    
Carrying Value $ 4,877.6 $ 4,787.0 [1]
Hedge funds [Member]    
Schedule of Investments [Line Items]    
Carrying Value 117.9 120.6
Unfunded Commitments 0.0 0.0
Private equity [Member]    
Schedule of Investments [Line Items]    
Carrying Value 254.1 211.8
Unfunded Commitments 102.6 120.5
Long only funds [Member]    
Schedule of Investments [Line Items]    
Carrying Value 133.0 153.0
Unfunded Commitments 0.0 0.0
Other [Member]    
Schedule of Investments [Line Items]    
Carrying Value 4.4 4.4
Unfunded Commitments 0.0 0.0
Other Investments [Member]    
Schedule of Investments [Line Items]    
Carrying Value 509.4 489.8
Unfunded Commitments $ 102.6 $ 120.5
[1] Derived from audited consolidated financial statements.