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Debt
6 Months Ended
Mar. 31, 2020
Debt Disclosure [Abstract]  
Debt
The Company's notes payable at their principal amounts, net of unamortized discounts and debt issuance costs, consist of the following:
March 31,
2020
September 30,
2019
(In millions)
Unsecured:
3.75% convertible senior notes due 2020$—  $116.7  
8.0% senior notes due 2024 (1)
344.5  343.8  
5.0% senior notes due 2028 (1)
295.6  —  
Revolving credit facility—  —  
$640.1  $460.5