Stockholders’ Equity - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	May 06, 2020	Aug. 06, 2014
Class of Stock [Line Items]
Remaining authorized repurchase amount	$ 171,600,000		$ 171,600,000		$ 333,300,000		$ 133,300,000
Repurchases of common stock	$ 3,000,000.0		$ 161,700,000	$ 110,400,000
Weighted-average Remaining Lease Term - Finance Leases	1 year 3 months 18 days		1 year 3 months 18 days
Weighted-average Remaining Lease Term - Operating Leases	6 years 6 months	6 years 6 months	6 years 6 months	6 years 6 months
Weighted-average Discount Rate - Finance Leases	0.60%	4.00%	0.60%	4.00%
Weighted-average Discount Rate - Operating Leases	3.30%	3.70%	3.30%	3.70%
Value of additional shares authorized to be repurchased						$ 200,000,000
Stock Repurchased and Retired During Period, Value	$ 3,000,000		$ 161,700,000	$ 110,400,000
Employee Stock Purchase Plan | Employee Stock Option
Class of Stock [Line Items]
Price per share (in dollars per share)	$ 56.77	$ 56.81	$ 56.77	$ 56.81
Employee Stock Purchase Plan | Employee Stock
Class of Stock [Line Items]
Shares issued under employee stock purchase plan (in shares)	22,000	18,000	54,000	44,000
Price per share (in dollars per share)	$ 61.74	$ 60.17	$ 61.74	$ 60.17
Compensation costs	$ 200,000	$ 200,000	$ 600,000	$ 500,000
Common Stock
Class of Stock [Line Items]
Repurchases of common stock (in shares)	100,000		2,100,000	1,600,000
Repurchases of common stock	$ 0		$ 200,000	$ 200,000
Average cost per share (in dollars per share)	$ 74.79		$ 77.58	$ 68.29
Weighted-average Remaining Lease Term - Finance Leases		1 year		1 year
Stock Repurchased and Retired During Period, Shares	40,000		2,085,000	1,617,000