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Risk Management Activities - Market Risk - Interest Rate - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of Financial Risk Management [line items] |  |
Borrowings | $ 1,526.9 | $ 1,845.8
Interest Bearing Borrowings [Member] | LIBOR [Member] |  |
Disclosure of Financial Risk Management [line items] |  |
Borrowings | 333.5 | 83.5
Change in Bank Bill Swap Bid Rate [member] | Interest Bearing Borrowings [Member] | Floating Interest Rate [member] |  |
Disclosure of Financial Risk Management [line items] |  |
Borrowings exposed to interest rate fluctuations | 200.0 | 168.5
Sensitivity to interest rates [member] | Interest Bearing Borrowings [Member] |  |
Disclosure of Financial Risk Management [line items] |  |
Borrowings exposed to interest rate fluctuations | $ 533.5 | $ 252.0

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