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Debt
 3 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Debt Debt
The detail of long-term debt was as follows:
December 31,
2019		September 30,
2019
Senior notes, fixed interest rate of 4.7%, due 2021$600.0  $600.0  
Senior notes, fixed interest rate of 4.7%, due 2022500.0  500.0  
U.S. revolving credit facility due 2020—  117.0  
Total long-term debt, including current maturities1,100.0  1,217.0  
Less current portion—  117.0  
Less unamortized debt issuance costs and discount (1) (2)
1.9  2.2  
Total long-term debt$1,098.1  $1,097.8  
(1)At December 31, 2019, the balance for the senior notes due 2021 and the senior notes due 2022 are reflected net of debt issuance costs of $0.6 and $1.0, respectively. At September 30, 2019, the balance for the senior notes due 2021 and the senior notes due 2022 are reflected net of debt issuance costs of $0.8 and $1.0, respectively.
(2)At December 31, 2019 and September 30, 2019, the balance for the senior notes due 2022 was reflected net of discount of $0.3 and $0.4, respectively.
The Company had outstanding variable-rate international borrowings, recorded in Notes payable, of $17.0 and $14.4 as of December 31, 2019 and September 30, 2019, respectively.