Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Tax benefit adjustment to the provisional income tax expense		$ 5.3
Unrecognized net operating loss carryforwards, foreign	$ 1.8	7.1	$ 11.5
Foreign jurisdictions income with tax holidays	87.0	107.1	124.1
Income Taxes [Line Items]
Tax credit, research and development	28.6
Valuation allowance for deferred tax assets	344.8	350.4
Net decrease in valuation allowance	$ 5.6
Income tax rate deduction dividend percent	100.00%
Tax loss carryforwards	$ 1,800.0
Tax loss carryforwards with no expiration date	1,500.0
Tax loss carryforwards with expiration date	265.0
Tax credit carryforwards	294.0
Deferred tax asset	477.2	445.5
Retained earnings	4,715.8	4,113.6
Unrecognized tax benefits	31.6	36.7	33.2	$ 29.5
Unrecognized tax benefits, interest and penalties	11.5	11.8
Decrease in unrecognized tax benefits, reasonably possible during the next twelve months	5.8
U.S.
Income Taxes [Line Items]
Valuation allowance for deferred tax assets	11.8
Foreign tax credits	137.0
Tax credit carryforwards, research	110.0
International jurisdictions
Income Taxes [Line Items]
Valuation allowance for deferred tax assets	333.0
Tax credit carryforwards, other	47.0
Accounting Standards Update 2016-16
Income Taxes [Line Items]
Deferred tax asset			2.3
Retained earnings		$ 2.3
Accounting Standards Update 2016-09
Income Taxes [Line Items]
Deferred tax asset				$ 52.9
Retained earnings			$ 52.9
Other Current Liabilities
Income Taxes [Line Items]
Unrecognized tax benefits	0.7
Other Long-term Liabilities
Income Taxes [Line Items]
Unrecognized tax benefits	$ 30.9