XML 109 R97.htm IDEA: XBRL DOCUMENT v3.7.0.1
Senior Unsecured Fixed Rate Notes - Schedule Of Unamortized Debt Issuance Costs Deducted From Carrying Value Of Debt Liability (Detail) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
Principal $ 143.8 $ 143.8
Less: unamortized debt issuance costs (4.3) (4.3)
Senior unsecured fixed rate notes, less unamortized debt issuance costs $ 139.5 $ 139.5 [1]
[1] Derived from audited consolidated financial statements.