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Notes Payable and Long-Term Debt - Narrative (Details) - Senior Notes $ in Millions | Feb. 28, 2019 USD ($)
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4.900% Senior Notes |
Debt Instrument [Line Items] |
Senior Notes, stated interest rate | 4.90%
Estimated fair value of senior notes | $ 304.6
5.625% Senior Notes |
Debt Instrument [Line Items] |
Senior Notes, stated interest rate | 5.625%
Estimated fair value of senior notes | $ 410.5
4.700% Senior Notes |
Debt Instrument [Line Items] |
Senior Notes, stated interest rate | 4.70%
Estimated fair value of senior notes | $ 508.0
3.950% Senior Notes |
Debt Instrument [Line Items] |
Senior Notes, stated interest rate | 3.95%
Estimated fair value of senior notes | $ 463.3

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