Other Comprehensive (Loss) Income - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			$ (202.9)
Amounts reclassified from accumulated other comprehensive loss	$ 1.0	$ 1.7	4.1	$ (65.9)
Ending Balance	(219.5)		(219.5)
Pension and OPEB Cost
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			(144.6)	(159.5)
Other comprehensive income (loss) before reclassifications			1.2
Amounts reclassified from accumulated other comprehensive loss			4.1	2.1
Impact of adopting ASU 2018-02			(22.1)
Other			0.6
Net change in accumulated other comprehensive loss			(16.2)	2.1
Ending Balance	(160.8)	(157.4)	(160.8)	(157.4)
Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			40.9	(15.5)
Other comprehensive income (loss) before reclassifications			(30.6)	43.6
Amounts reclassified from accumulated other comprehensive loss	0.0	2.8	0.0	2.8
Net change in accumulated other comprehensive loss			(30.6)	46.4
Ending Balance	10.3	30.9	10.3	30.9
AOCI Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			(103.7)	(55.7)
Other comprehensive income (loss) before reclassifications			(29.4)	(4.9)
Amounts reclassified from accumulated other comprehensive loss			4.1	(65.9)
Impact of adopting ASU 2018-02			(22.1)
Other			0.6
Net change in accumulated other comprehensive loss			(46.8)	(70.8)
Ending Balance	$ (150.5)	$ (126.5)	$ (150.5)	(126.5)
Changes in the Fair Value of Available-for-Sale Securities
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance				119.3
Other comprehensive income (loss) before reclassifications				(48.5)
Amounts reclassified from accumulated other comprehensive loss				(70.8)
Net change in accumulated other comprehensive loss				$ (119.3)

Other comprehensive income (loss) net of tax including impact of new accounting pronouncement.

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Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act.

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

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Amount of increase (decrease) in other comprehensive income, after tax, from changes classified as other.

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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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