Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements - Schedule of borrowings (Details)

v3.10.0.1
Financing Agreements - Schedule of borrowings (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
Sep. 30, 2018
USD ($)
Dec. 15, 2014
Financing Agreements        
Total debt $ 364.8   $ 344.6  
Less: current portion 0.0   0.0  
Long-term debt $ 364.8   $ 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)        
Financing Agreements        
Debt Instrument, Interest Rate During Period 2.37% 1.44%    
Total debt $ 115.8   $ 95.7  
$150 senior unsecured notes, net of discount (1)        
Financing Agreements        
Total debt 149.4   149.3  
$100 Series A Notes (2)        
Financing Agreements        
Total debt $ 99.6   $ 99.6  
Stated interest rate       4.60%