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Long-Term Debt and Short-Term Borrowings - Long-Term Debt - Narrative (Detail)				6 Months Ended
	Mar. 18, 2021 USD ($)	Mar. 04, 2019 USD ($)	Aug. 13, 2015 USD ($)	Jun. 30, 2021 USD ($)	Jul. 09, 2021 USD ($)	Jun. 30, 2021 EUR (€)	Dec. 31, 2020
2019 Credit Agreement | Senior Notes
Debt Instrument [Line Items]
Minimum coverage ratio of EBITDA to total interest expense expressed in percentage				2.00%
Maximum leverage ratio of total debt less available cash to EBITDA expressed in percentage				4.25%
Maximum leverage ratio during first four quarter that qualified acquisition is consummated				4.75%
Coverage ratio of EBITDA to total interest expense expressed in percentage				39.78%		39.78%
Leverage ratio of total debt less available cash to EBITDA expressed in percentage				(0.02%)		(0.02%)
4.875% Senior Notes | Senior Notes
Debt Instrument [Line Items]
Face amount of debt			$ 600,000,000.0
Interest rate of long-term debt			4.875%	4.875%		4.875%
Redemption price percentage			99.24%
2.5% Senior Notes | Senior Notes
Debt Instrument [Line Items]
Face amount of debt	$ 500,000,000.0
Interest rate of long-term debt	2.50%			2.50%		2.50%	2.50%
Principal amount of debt issued, percentage of face value	98.451%
Redemption price, discount rate, adjustment to treasury rate	0.20%
Senior notes outstanding				$ 487,600,000
2.5% Senior Notes | Senior Notes | On Or After January 1, 2031
Debt Instrument [Line Items]
Redemption price percentage	100.00%
Tranche A term loan facility | 2019 Credit Agreement
Debt Instrument [Line Items]
Repayments on line of credit		$ 300,000,000.0
Face amount of debt | €						€ 300,000,000.0
Maximum leverage ratio				2.50%
Revolving credit facility | 2019 Credit Agreement
Debt Instrument [Line Items]
Amounts available to borrow under credit agreement				$ 2,800,000,000
Revolving credit facility | 2019 Credit Agreement | Subsequent Event
Debt Instrument [Line Items]
Increase in revolving credit commitment					$ 350,000,000.0
Increase in domestic borrowings					330,000,000.0
Increase in U.K. borrowings					$ 20,000,000.0
Euro term loan facility | 2019 Credit Agreement
Debt Instrument [Line Items]
Face amount of debt | €						€ 400,000,000.0

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