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(Additional Information) (Details) - Senior Notes - USD ($) $ in Millions | Aug. 31, 2018 | Feb. 28, 2018 | Aug. 31, 2016
--- | --- | --- | ---
4.900% Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior Notes, stated interest rate | 4.90% |  |
Estimated fair value of senior notes | $ 306.5 |  |
5.625% Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior Notes, stated interest rate | 5.625% |  |
Estimated fair value of senior notes | $ 415.7 |  |
4.700% Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior Notes, stated interest rate | 4.70% |  |
Estimated fair value of senior notes | $ 503.5 |  |
3.950% Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Senior Notes, stated interest rate | 3.95% | 3.95% | 3.95%
Estimated fair value of senior notes | $ 476.0 |  |

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