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Defined Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Accrued benefit liability	$ (159.5)	$ (201.4)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current benefit payment liability	(1.4)	(1.4)
Accrued benefit liability	(147.2)	(198.5)
Net amount recognized	(148.6)	(199.9)
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current benefit payment liability	(1.1)	(0.7)
Accrued benefit liability	(12.3)	(2.9)
Net amount recognized	$ (13.4)	$ (3.6)

X

- 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.

+ References

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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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