Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements - Schedule of borrowings (Details)

v3.20.4
Financing Agreements - Schedule of borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Total debt $ 1,396.4 $ 1,552.6  
Other 0.2 0.2  
Current portion of long-term debt (28.1) (36.3)  
Long-term debt 1,368.3 1,516.3  
$900.0 revolving credit facility (excluding outstanding letters of credit)      
Debt Instrument [Line Items]      
Total debt 63.0 0.0  
HI_500TermLoan [Member]      
Debt Instrument [Line Items]      
Debt Issuance Costs, Line of Credit Arrangements, Gross 1.2   $ 1.3
Total debt 467.5 473.7  
Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Issuance Costs, Line of Credit Arrangements, Gross 5.0 5.2  
Total debt 370.9 370.8  
Senior Notes [Member] | 2020 Notes [Member]      
Debt Instrument [Line Items]      
Total debt 395.0 394.8  
HI_225TermLoan [Member]      
Debt Instrument [Line Items]      
Debt Issuance Costs, Line of Credit Arrangements, Gross 3.6 3.7  
Total debt 0.0 213.4  
$150 senior unsecured notes [Member]      
Debt Instrument [Line Items]      
Debt Issuance Costs, Line of Credit Arrangements, Gross   0.3  
$100.0 Series A Notes (5)      
Debt Instrument [Line Items]      
Debt Issuance Costs, Line of Credit Arrangements, Gross 0.2 0.3  
Total debt $ 99.8 $ 99.7