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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Taxes Disclosure [Line Items]
Decrease in unrecognized tax benefits within the next twelve months	$ 310.0				$ 310.0
Increase in unrecognized tax benefits within the next twelve months	20.0				20.0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	600.0				600.0
Provisional net tax benefit	$ 13.7			$ (8.4)	$ 8.5	$ (53.9)
Effective tax rate	6.20%			6.00%	1.20%	12.50%
Impairment					$ 612.0
U.S. corporate income tax rate					21.00%
Tax Reform and AHV Financing [Member]
Income Taxes Disclosure [Line Items]
Provisional net tax benefit		$ 51.2	$ 263.8