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Derivatives - Additional Information (Detail) - Cross Currency Swaps [Member] - USD ($)
3 Months Ended
Dec. 31, 2019
Jun. 30, 2020
Sep. 30, 2019
Derivative [Line Items]      
Fair value of swaps, net asset   $ 10,000,000 $ 1,000,000
Net Investment Hedge [Member]      
Derivative [Line Items]      
Notional Amount   250,000,000  
Cumulative gain (loss) related to swaps   $ 13,000,000 $ 5,000,000
Net Investment Hedge [Member] | Fixed Rate Debt [Member]      
Derivative [Line Items]      
Derivative Instruments Frequency of Cash Settlements semi-annually