Accumulated Other Comprehensive (Loss) Income - After-Tax Components of and Changes in Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 2,427.8	$ 2,180.0
Amounts classified into accumulated other comprehensive (loss) income	(50.2)	9.4
Amounts reclassified from accumulated other comprehensive (loss) income	(0.4)	(1.1)
Other comprehensive (loss) income, net of tax	(50.6)	(0.3)
Ending Balance	2,357.9	2,247.1
ASU 2018-02 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Adoption of ASU 2018-02		(8.6)
Foreign Currency Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(11.5)	(25.3)
Amounts classified into accumulated other comprehensive (loss) income	(41.7)	8.8
Other comprehensive (loss) income, net of tax	(41.7)	8.8
Ending Balance	(53.2)	(16.5)
Derivative Hedging Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	5.5	4.2
Amounts classified into accumulated other comprehensive (loss) income	(7.7)	0.6
Amounts reclassified from accumulated other comprehensive (loss) income	(0.4)	(1.1)
Other comprehensive (loss) income, net of tax	(8.1)	(0.5)
Ending Balance	(2.6)	3.7
Defined Benefit Plan Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(66.6)	(45.9)
Amounts classified into accumulated other comprehensive (loss) income	(0.8)
Other comprehensive (loss) income, net of tax	(0.8)	(8.6)
Ending Balance	(67.4)	(54.5)
Defined Benefit Plan Adjustments [Member] \| ASU 2018-02 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Adoption of ASU 2018-02		(8.6)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(72.6)	(67.0)
Ending Balance	$ (123.2)	$ (67.3)

Amount increase decrease in after tax and reclassification adjustments of other comprehensive income (loss).

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Amount after tax, before 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 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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