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Debt (Tables)
 9 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
The detail of long-term debt was as follows:
June 30,
2020		September 30,
2019
Senior notes, fixed interest rate of 4.7%, due 2021$—  $600.0  
Senior notes, fixed interest rate of 4.7%, due 2022500.0  500.0  
Senior notes, fixed interest rate of 5.5%, due 2028750.0  —  
U.S. revolving credit facility due 2020—  117.0  
U.S. revolving credit facility due 2025—  —  
Total long-term debt, including current maturities1,250.0  1,217.0  
Less current portion—  117.0  
Less unamortized debt issuance costs and discount (1) (2)
12.6  2.2  
Total long-term debt$1,237.4  $1,097.8  
(1)At June 30, 2020, the balance for the Senior Notes due 2022 and the Senior Notes due 2028 are reflected net of debt issuance costs of $0.7 and $11.6, 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 June 30, 2020 and September 30, 2019, the balance for the Senior Notes due 2022 was reflected net of discount of $0.3 and $0.4, respectively.