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Fair Value Quantitative and Qualitative Disclosures - Summary of Sensitivity Analysis Related to WACC (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Growth Rate At 2.00% [member] | WACC At 97.5%[member]
Disclosure of fair value measurement of assets and liability [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets	$ 370.9
Growth Rate At 2.00% [member] | WACC At 100%[member]
Disclosure of fair value measurement of assets and liability [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets	366.2
Growth Rate At 2.00% [member] | WACC At 102.5%[member]
Disclosure of fair value measurement of assets and liability [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets	361.7
Growth Rate At 3.00% [member] | WACC At 97.5%[member]
Disclosure of fair value measurement of assets and liability [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets	391.8
Growth Rate At 3.00% [member] | WACC At 100%[member]
Disclosure of fair value measurement of assets and liability [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets	386.8
Growth Rate At 3.00% [member] | WACC At 102.5%[member]
Disclosure of fair value measurement of assets and liability [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets	381.9
Growth rate At 4.00% [member] | WACC At 97.5%[member]
Disclosure of fair value measurement of assets and liability [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets	416.5
Growth rate At 4.00% [member] | WACC At 100%[member]
Disclosure of fair value measurement of assets and liability [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets	411.1
Growth rate At 4.00% [member] | WACC At 102.5%[member]
Disclosure of fair value measurement of assets and liability [line items]
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets	$ 405.9

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- Definition

Disclosure of fair value measurement of assets and liability.

+ References

No definition available.

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- Definition

The amount of increase (decrease) in the fair value measurement of assets due to a reasonably possible increase in an unobservable input.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2020-01-01
-Paragraph 93
-Subparagraph h
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_h_ii&doctype=Standard
-URIDate 2020-01-01

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