Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Taxes Disclosure [Line Items]
Decrease in unrecognized tax benefits within the next twelve months	$ 140.0		$ 140.0
Increase in unrecognized tax benefits within the next twelve months	170.0		170.0
Provisional net tax benefit	$ 247.4	$ 8.5	$ 193.5	$ (71.6)
Effective tax rate	(134.10%)	(5.50%)	(31.40%)	12.10%
U.S. corporate income tax rate			21.00%
Tax benefit resulting from return to provision adjustments		$ 16.9		$ 16.9
Tax Reform and AHV Financing [Member]
Income Taxes Disclosure [Line Items]
Provisional net tax benefit	$ 263.8		$ 263.8

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of increase reasonably possible in the next twelve months for the unrecognized tax benefit.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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