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Debt - Summary of senior unsecured notes (Detail)
$ in Millions
Sep. 12, 2019
USD ($)
Senior Unsecured Notes Series L [Member]  
Term 7 years
Interest Rate 3.31%
Face Value $ 200
Maturity Date Sep. 30, 2026
Senior Unsecured Notes Series M [Member]  
Term 10 years
Interest Rate 3.53%
Face Value $ 300
Maturity Date Sep. 30, 2029