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Derivatives Hedges and Financial Instruments - Summary of Financial Instruments with Fair Values Significantly Different from Carrying Amounts Except for Senior Secured Notes (Detail) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Secured Notes	$ 98.0	$ 103.25
Senior Secured Notes [Member] | Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Secured Notes	435,000,000	435,000,000
Senior Secured Notes [Member] | Estimated Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior Secured Notes	$ 426,000,000	$ 449,000,000

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

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- Details

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- Details

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- Details

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