Stockholder's Equity - Shares of Common Stock Issued Under Employee Stock Purchase Plan (Details) - $ / shares	3 Months Ended
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)	3,730	4,663
Number of shares available, ending balance (in shares)	124,056
Per share price of shares issued during period (in dollars per share)	$ 133.19	$ 130.87

Number of shares issued during the period as a result of an employee stock purchase plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration