Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements - Schedule of borrowings (Details)

v3.19.2
Financing Agreements - Schedule of borrowings (Details)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
Jun. 30, 2019
USD ($)
Jun. 30, 2018
Sep. 30, 2018
USD ($)
Debt Instrument [Line Items]          
Total debt $ 324.4   $ 324.4   $ 344.6
Other Long-term Debt, Current 1.2   1.2   0.0
Long-term debt $ 323.2   $ 323.2   $ 344.6
Debt Instrument, Covenant Holiday, Maximum Ratio of Indebtedness to Earnings before Interest, Taxes, Depreciation, and Amortization         3.5
$900 revolving credit facility (excluding outstanding letters of credit)          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate During Period 2.89% 1.70% 2.66% 1.77%  
Total debt $ 74.0   $ 74.0   $ 95.7
$150 senior unsecured notes, net of discount (1)          
Debt Instrument [Line Items]          
Total debt 149.5   149.5   149.3
$100 Series A Notes (2)          
Debt Instrument [Line Items]          
Total debt $ 99.7   $ 99.7   $ 99.6