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Debt (Tables)
12 Months Ended
Sep. 30, 2020
Debt Disclosure [Abstract]  
Debt
The Company's notes payable at their carrying amounts consist of the following:
September 30,
 20202019
 (In millions)
Unsecured:
3.75% convertible senior notes due 2020
$— $116.7 
8.0% senior notes due 2024 (1)
345.2 343.8 
5.0% senior notes due 2028 (1)
295.9 — 
Revolving credit facility— — 
$641.1 $460.5