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Employee Benefit Plans - Schedule of Combined Funded Status and Net Periodic Pension Cost and Postretirement Benefit - Postretirement Benefits (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
Cumulative effect adjustment			$ 1,211.0
ASU 2018-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Cumulative effect adjustment		$ 30.8
Other Postretirement Benefits Plan [Member]
Accumulated other comprehensive loss, tax	$ (5.4)	(6.1)
Other Postretirement Benefits Plan [Member] | ASU 2018-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Cumulative effect adjustment		$ 3.3

X

- Definition

Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Tax

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No definition available.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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