Notes Payable and Long-Term Debt - Narrative (Details) - Senior Notes $ in Millions	Feb. 28, 2019 USD ($)
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

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

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