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Accumulated Other Comprehensive (Loss) Income - After-Tax Components of and Changes in Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 2,601.1	$ 2,363.0	$ 2,453.8
Amounts reclassified from accumulated other comprehensive (loss) income into earnings	1.3	(4.4)
Other comprehensive (loss) income, net of tax	(27.8)	32.7	(19.4)
Ending Balance	2,180.0	2,601.1	2,363.0
Foreign Currency Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	5.8	(28.0)	(13.3)
Amounts classified into accumulated other comprehensive (loss) income	(31.1)	33.8	(14.7)
Other comprehensive (loss) income, net of tax	(31.1)	33.8	(14.7)
Ending Balance	(25.3)	5.8	(28.0)
Derivative Hedging Losses (Gains) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2.4)	(0.6)	2.1
Amounts classified into accumulated other comprehensive (loss) income	8.3	(1.0)	(6.2)
Amounts reclassified from accumulated other comprehensive (loss) income into earnings	(1.7)	(0.8)	3.5
Other comprehensive (loss) income, net of tax	6.6	(1.8)	(2.7)
Ending Balance	4.2	(2.4)	(0.6)
Defined benefit plan items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(42.6)	(43.3)	(41.3)
Amounts classified into accumulated other comprehensive (loss) income	(6.3)	4.3	5.3
Amounts reclassified from accumulated other comprehensive (loss) income into earnings	3.0	(3.6)	(7.3)
Other comprehensive (loss) income, net of tax	(3.3)	0.7	(2.0)
Ending Balance	(45.9)	(42.6)	(43.3)
Accumulated Other Comprehensive (Loss) Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(39.2)	(71.9)	(52.5)
Amounts classified into accumulated other comprehensive (loss) income	(29.1)	37.1	(15.6)
Amounts reclassified from accumulated other comprehensive (loss) income into earnings	1.3	(4.4)	(3.8)
Other comprehensive (loss) income, net of tax	(27.8)	32.7	(19.4)
Ending Balance	$ (67.0)	$ (39.2)	$ (71.9)

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

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Amount after tax and 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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