Quarterly report pursuant to Section 13 or 15(d)

Stockholder's Equity - Shares of Common Stock Issued Under Employee Stock Purchase Plan (Details)

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Stockholder's Equity - Shares of Common Stock Issued Under Employee Stock Purchase Plan (Details) - $ / shares
3 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]      
Number of shares available, beginning balance (in shares)     132,449
Shares issued during period (in shares) 3,454 3,730 4,663
Number of shares available, ending balance (in shares) 120,602    
Per share price of shares issued during period (in dollars per share) $ 165.60 $ 133.19 $ 130.87