Stockholders’ Equity - Schedule of Income Tax Provision (Benefit) Allocated to Components of OCI (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Foreign currency translation adjustments	$ (0.2)	$ (3.7)	$ (0.5)
Unrecognized pension and postretirement costs	0.2	(11.3)	(12.3)
Derivative financial instruments	(2.8)	18.6	(8.7)
Income tax related to AOCL	$ (2.8)	$ 33.6	$ 4.1

No definition available.

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

+ References

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

+ References

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Amount of tax (expense) benefit for reclassification adjustment from accumulated other comprehensive (income) loss of defined benefit plan.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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