Stockholder's Equity - Shares of Common Stock Issued Under Employee Stock Purchase Plan (Details) - $ / shares	3 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Number of shares available, beginning balance (in shares)			118,136
Shares issued during period (in shares)	3,445	3,152	3,204
Number of shares available, ending balance (in shares)	108,335
Per share price of shares issued during period (in dollars per share)	$ 190.25	$ 181.65	$ 202.66