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Earnings Per Share - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 17 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Feb. 29, 2020 | Nov. 30, 2019 | Aug. 31, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Aug. 31, 2018 | Feb. 29, 2020 | Feb. 28, 2019 | Mar. 31, 2020 | Oct. 29, 2019 | Oct. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings from discontinued operations (in dollars per share) |  | $ 0.00 |  |  | $ 0.02 |  |  | $ 0 | $ 0.02 |  |  |
Diluted earnings from discontinued operations (in dollars per share) |  | $ 0.00 |  |  | $ 0.02 |  |  | $ 0.00 | $ 0.02 |  |  |
Options granted and excluded from the computation of diluted earnings per share (in shares) |  | 200,000 |  |  | 700,000 |  |  | 200,000 | 500,000 |  |  |
Stock purchased under share buyback |  | $ 2,586,000 | $ 1,911,000 | $ 256,830,000 | $ 100,095,000 | $ 368,661,000 | $ 139,468,000 |  |  |  |  |
Employee Payroll Taxes Due on Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock purchased under share buyback (shares) |  | 100,000 |  |  |  |  |  | 300,000 |  |  |  |
Stock purchased under share buyback, average price per share (in dollars per share) |  | $ 278.21 |  |  |  |  |  | $ 261.48 |  |  |  |
Stock purchased under share buyback |  | $ 2,500,000 |  |  |  |  |  | $ 68,400,000 |  |  |  |
October 30, 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share buyback program, authorized amount |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0
Stock purchased under share buyback (shares) |  | 0 |  |  |  |  |  | 800,000 |  |  |  |
Stock purchased under share buyback, average price per share (in dollars per share) |  |  |  |  |  |  |  | $ 230.66 |  |  |  |
Stock purchased under share buyback |  |  |  |  |  |  |  | $ 193,100,000 |  |  |  |
October 29, 2019 Plan |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Share buyback program, authorized amount |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 |
Stock purchased under share buyback (shares) |  | 0 |  |  |  |  |  | 0 |  |  |  |
Subsequent Event | October 30, 2018 Plan |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock purchased under share buyback (shares) | 800,000 |  |  |  |  |  |  |  |  | 4,300,000 |  |
Stock purchased under share buyback, average price per share (in dollars per share) | $ 263.07 |  |  |  |  |  |  |  |  | $ 219.40 |  |
Stock purchased under share buyback | $ 202,600,000 |  |  |  |  |  |  |  |  | $ 939,100,000 |  |

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