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Pensions and Postretirement Benefits - Schedule of Pre-Tax Charges Recognized in Accumulated Other Comprehensive Income Loss (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax
Net actuarial (gain) loss	$ 41.7	$ 47.1
Prior service cost	0.9	0.6
Accumulated other comprehensive income	42.6	47.7
Other Benefits
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax
Net actuarial (gain) loss	(0.4)	0.2
Prior service cost	0.0	0.0
Accumulated other comprehensive income	$ (0.4)	$ 0.2

X

- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

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-Publisher FASB
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-Topic 220
-SubTopic 10
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-Publisher FASB
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-Section 50
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- Definition

Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (j)
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- Definition

Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (j)
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