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Defined Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Accrued benefit liability	$ (201.4)	$ (163.3)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current benefit payment liability	(1.4)	(1.5)
Accrued benefit liability	(198.5)	(162.1)
Net amount recognized	(199.9)	(163.6)
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current benefit payment liability	(0.7)	(0.2)
Accrued benefit liability	(2.9)	(1.2)
Net amount recognized	$ (3.6)	$ (1.4)

X

- Definition

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

+ References

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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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