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Senior Unsecured Fixed Rate Notes - Schedule Of Unamortized Debt Issuance Costs Deducted From Carrying Value Of Debt Liability (Detail) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Principal $ 143.8 $ 143.8
Less: unamortized debt issuance costs (3.8) (3.8)
Senior unsecured fixed rate notes, less unamortized debt issuance costs $ 140.0 $ 140.0 [1]
[1] Derived from audited consolidated financial statements.