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Accumulated Other Comprehensive Income - Amounts Reclassified Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Postretirement Plans:
Total reclassification for the period	$ 35.2	$ 38.5	$ 104.9	$ 115.8
Postretirement Plans
Postretirement Plans:
Amortization of postretirement plan items, before tax	36.2	39.8	107.9	119.6
Income tax benefit	(1.0)	(1.3)	(3.0)	(3.8)
Total reclassification for the period			104.9
Amortization of prior service cost
Postretirement Plans:
Amortization of postretirement plan items, before tax	(1.4)	(1.7)	(4.4)	(5.3)
Amortization of actuarial losses
Postretirement Plans:
Amortization of postretirement plan items, before tax	$ 37.6	$ 41.5	$ 112.3	$ 124.9

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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

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