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Notes Payable, Long-Term Debt and Capital Lease Obligations - Narrative (Details) - Senior Notes
$ in Millions
Feb. 28, 2018
USD ($)
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 $ 424.4
4.700% Senior Notes  
Debt Instrument [Line Items]  
Senior Notes, stated interest rate 4.70%
Estimated fair value of senior notes $ 517.5
3.950% Senior Notes  
Debt Instrument [Line Items]  
Senior Notes, stated interest rate 3.95%
Estimated fair value of senior notes $ 480.2