Borrowings - Narrative (Details) - USD ($)							3 Months Ended		9 Months Ended
	Jun. 16, 2021	May 28, 2021	May 17, 2021	May 27, 2020	Apr. 29, 2020	May 31, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Line of Credit Facility [Line Items]
Less unaccreted debt discount							$ 1,390,000		$ 1,390,000		$ 949,000
Interest									17,839,000	$ 16,415,000
Revolving Facility
Line of Credit Facility [Line Items]
Borrowing capacity						$ 800,000,000
Extension period						1 year
Letters of credit outstanding							7,200,000		7,200,000
Amount available to borrow							$ 792,800,000		$ 792,800,000
Minimum | Revolving Facility
Line of Credit Facility [Line Items]
Applicable leverage ratio							0.00%		0.00%
Maximum | Revolving Facility
Line of Credit Facility [Line Items]
Applicable leverage ratio							1.275%		1.275%
Senior Notes | 2.625% Senior Notes, due June 2031
Line of Credit Facility [Line Items]
Face amount of debt		$ 500,000,000.0
Stated interest rate			2.625%				2.625%		2.625%
Proceeds from debt, net		494,700,000
Less unaccreted debt discount		600,000
Underwriting commission		3,300,000
Offering expenses		1,400,000
Redemption price, percentage			101.00%
Senior Notes | 2.625% Senior Notes, due June 2031 | Minimum
Line of Credit Facility [Line Items]
Percent of notes held							25.00%		25.00%
Senior Notes | 4.20% Senior Notes, due December 2021
Line of Credit Facility [Line Items]
Stated interest rate							4.20%		4.20%		4.20%
Extinguishment of debt		350,000,000	$ 350,000,000
Redemption premium		$ 6,700,000	6,700,000
Amount to be recognized from hedged transactions within 12 months, approximate	$ 1,300,000
Write off of deferred debt issuance cost			100,000
Write off of debt remaining discount			100,000
Write off deferred taxes			$ 400,000
Loss on early debt redemption							$ 8,600,000		$ 8,600,000
Senior Notes | 3.00% Senior Notes, due May 2030
Line of Credit Facility [Line Items]
Face amount of debt					$ 500,000,000
Stated interest rate					3.00%		3.00%		3.00%
Proceeds from debt, net					$ 494,400,000
Less unaccreted debt discount					900,000
Underwriting commission					3,300,000
Offering expenses					$ 1,400,000
Senior Notes | 4.5% Senior Notes
Line of Credit Facility [Line Items]
Stated interest rate				4.50%	4.50%		4.50%		4.50%
Extinguishment of debt				$ 300,000,000	$ 300,000,000
Redemption premium				6,800,000
Amount to be recognized from hedged transactions within 12 months, approximate				1,400,000
Write off of deferred debt issuance cost				100,000
Write off of debt remaining discount				100,000
Loss on early debt redemption								$ 8,400,000		$ 8,400,000
Interest				$ 6,100,000
Letters of Credit | Revolving Facility
Line of Credit Facility [Line Items]
Borrowing capacity						$ 75,000,000
Swing Line Loans | Revolving Facility
Line of Credit Facility [Line Items]
Borrowing capacity						$ 50,000,000