Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements - Schedule of borrowings (Details)

v3.20.1
Financing Agreements - Schedule of borrowings (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Sep. 30, 2019
Debt Instrument [Line Items]    
Debt Issuance Costs, Line of Credit Arrangements, Gross $ 2.0  
Total debt 1,873.3 $ 619.5
Other 1.6 0.0
Current portion of long-term debt 46.7 0.0
Long-term debt 1,826.6 619.5
$900.0 revolving credit facility (excluding outstanding letters of credit)    
Debt Instrument [Line Items]    
Total debt 537.6 0.0
HI_500TermLoan [Member]    
Debt Instrument [Line Items]    
Debt Issuance Costs, Line of Credit Arrangements, Gross 1.5  
Total debt 492.3 0.0
$150.0 senior unsecured notes, net of discount (4)    
Debt Instrument [Line Items]    
Debt Issuance Costs, Line of Credit Arrangements, Gross 4.0 4.3
Total debt 370.4 370.1
HI_225TermLoan [Member]    
Debt Instrument [Line Items]    
Debt Issuance Costs, Line of Credit Arrangements, Gross 0.4  
Total debt 221.8 0.0
$150 senior unsecured notes [Member]    
Debt Instrument [Line Items]    
Debt Issuance Costs, Line of Credit Arrangements, Gross 0.1 0.2
Total debt 149.9 149.7
$100.0 Series A Notes (5)    
Debt Instrument [Line Items]    
Debt Issuance Costs, Line of Credit Arrangements, Gross 0.3  
Total debt $ 99.7 $ 99.7