Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements - Schedule of borrowings (Details)

v3.22.2
Financing Agreements - Schedule of borrowings (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Sep. 30, 2021
Debt Instrument [Line Items]    
Total debt $ 1,214.6 $ 1,212.9
Current portion of long-term debt 0.0 0.0
Long-term debt 1,214.6 1,212.9
$400 senior unsecured notes (1)    
Debt Instrument [Line Items]    
Total debt 396.7 395.8
Debt Issuance Costs, Line of Credit Arrangements, Gross 3.3 4.2
$375 senior unsecured notes, net of discount (2)    
Debt Instrument [Line Items]    
Total debt 372.0 371.5
Debt Issuance Costs, Line of Credit Arrangements, Gross 2.6 3.1
$350 senior unsecured notes (3)    
Debt Instrument [Line Items]    
Total debt 346.1 345.8
Debt Issuance Costs, Line of Credit Arrangements, Gross 3.9 4.2
$100 Series A Notes (4)    
Debt Instrument [Line Items]    
Total debt 99.8 99.8
Debt Issuance Costs, Line of Credit Arrangements, Gross 0.2 0.2
$1,000 revolving credit facility (excluding outstanding letters of credit)    
Debt Instrument [Line Items]    
Total debt $ 0.0 $ 0.0