Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements - Schedule of borrowings (Details)

v3.21.1
Financing Agreements - Schedule of borrowings (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Sep. 30, 2020
Debt Instrument [Line Items]    
Total debt $ 1,211.9 $ 1,552.6
Other 0.2 0.2
Current portion of long-term debt 0.0 36.3
Long-term debt 1,211.9 1,516.3
$500.0 term loan (1)    
Debt Instrument [Line Items]    
Total debt 0.0 473.7
Debt Issuance Costs, Line of Credit Arrangements, Gross 1.3  
$400.0 senior unsecured notes (2)    
Debt Instrument [Line Items]    
Total debt 395.3 394.8
Debt Issuance Costs, Line of Credit Arrangements, Gross 4.7 5.2
$375.0 senior unsecured notes, net of discount (3)    
Debt Instrument [Line Items]    
Total debt 371.1 370.8
Debt Issuance Costs, Line of Credit Arrangements, Gross 3.4 3.7
$350.0 senior unsecured notes (4)    
Debt Instrument [Line Items]    
Total debt 345.5 0.0
Debt Issuance Costs, Line of Credit Arrangements, Gross 4.5  
$225.0 term loan (5)    
Debt Instrument [Line Items]    
Total debt 0.0 213.4
Debt Issuance Costs, Line of Credit Arrangements, Gross   0.3
$100.0 Series A Notes (6)    
Debt Instrument [Line Items]    
Total debt 99.8 99.7
Debt Issuance Costs, Line of Credit Arrangements, Gross 0.2 0.3
$900.0 revolving credit facility (excluding outstanding letters of credit)    
Debt Instrument [Line Items]    
Total debt $ 0.0 $ 0.0