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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
Jun. 30, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Principal $ 143.8 $ 143.8
Less: unamortized debt issuance costs (3.9) (4.0)
Senior unsecured fixed rate notes, less unamortized debt issuance costs $ 139.9 $ 139.8 [1]
[1] Derived from audited consolidated financial statements.