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Accumulated Other Comprehensive Loss - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Equity [Abstract]
Reclassification adjustment from AOCL, Pension and other postretirement benefit plans, pre-tax	$ 2.2	$ 3.4	$ 4.2	$ 6.9
Reclassification adjustment from AOCL, Derivative financial instruments, pre-tax (income) expense	$ 1.0	$ (6.2)	$ 5.2	$ (19.3)

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Amount before tax 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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for net period benefit cost (credit) of defined benefit plan.

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-Publisher FASB
-Name Accounting Standards Codification
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