Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements - Schedule of borrowings (Details)

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Financing Agreements - Schedule of borrowings (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Dec. 15, 2014
Financing Agreements            
Total debt $ 595.3   $ 595.3   $ 608.9  
Less: current portion (16.9)   (16.9)   (13.8)  
Long-term debt 578.4   578.4   595.1  
$700 revolving credit facility (excluding outstanding letters of credit)            
Financing Agreements            
Long-term Debt, Gross $ 195.0   $ 195.0   198.5  
Debt Instrument, Interest Rate During Period 1.46% 1.60% 1.43% 1.43%    
Term loan            
Financing Agreements            
Long-term Debt, Gross $ 151.9   $ 151.9   162.0  
Debt Instrument, Interest Rate During Period 2.39% 1.90% 2.16% 1.71%    
$150 senior unsecured notes, net of discount (1)            
Financing Agreements            
Long-term Debt, Gross $ 149.4   $ 149.4      
Total debt 148.8   148.8   148.5  
$100 Series A Notes (2)            
Financing Agreements            
Long-term Debt, Gross 100.0   100.0      
Total debt 99.6   99.6   99.6  
Stated interest rate           4.60%
Borrowings [Member]            
Financing Agreements            
Total debt $ 0.0   $ 0.0   $ 0.3