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Defined Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Accrued benefit liability	$ (79.7)	$ (159.5)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current benefit payment liability	(1.4)	(1.4)
Accrued benefit liability	(67.9)	(147.2)
Net amount recognized	(69.3)	(148.6)
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current benefit payment liability	(1.5)	(1.1)
Accrued benefit liability	(11.8)	(12.3)
Net amount recognized	$ (13.3)	$ (13.4)

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- Definition

Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as current.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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