Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Details)

v3.3.0.814
Fair Value Measurements (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Dec. 15, 2014
Sep. 30, 2014
Jul. 09, 2010
Additional disclosures        
Stated interest rate 5.50%      
$150 senior unsecured notes        
Additional disclosures        
Term of debt issued 10 years      
Stated interest rate 5.50%     5.50%
$100 Series A Notes        
Additional disclosures        
Stated interest rate   4.60%    
Carrying Value        
Assets:        
Cash and cash equivalents $ 48.3   $ 58.0  
Investments in rabbi trust 4.6   5.0  
Derivative instruments 1.1   1.2  
Liabilities:        
Revolving credit facilities 107.6   229.6  
Term loan 171.0   180.0  
Derivative instruments 5.8   4.1  
Additional disclosures        
Carrying amount of private equity limited partnerships for which fair value is not readily available 8.3   12.1  
Carrying Value | $150 senior unsecured notes        
Liabilities:        
Senior notes 149.1   148.9  
Carrying Value | $100 Series A Notes        
Liabilities:        
Senior notes 100.0      
Level 1        
Assets:        
Cash and cash equivalents 48.3   58.0  
Investments in rabbi trust 4.6   5.0  
Derivative instruments 0.0   0.0  
Liabilities:        
Revolving credit facilities 0.0   0.0  
Term loan 0.0   0.0  
Derivative instruments 0.0   0.0  
Level 1 | $150 senior unsecured notes        
Liabilities:        
Senior notes 165.0   163.7  
Level 1 | $100 Series A Notes        
Liabilities:        
Senior notes 0.0      
Level 2        
Assets:        
Cash and cash equivalents 0.0   0.0  
Investments in rabbi trust 0.0   0.0  
Derivative instruments 1.1   1.2  
Liabilities:        
Revolving credit facilities 107.6   229.6  
Term loan 171.0   180.0  
Derivative instruments 5.8   4.1  
Level 2 | $150 senior unsecured notes        
Liabilities:        
Senior notes 0.0   0.0  
Level 2 | $100 Series A Notes        
Liabilities:        
Senior notes 100.6      
Level 3        
Assets:        
Cash and cash equivalents 0.0   0.0  
Investments in rabbi trust 0.0   0.0  
Derivative instruments 0.0   0.0  
Liabilities:        
Revolving credit facilities 0.0   0.0  
Term loan 0.0   0.0  
Derivative instruments 0.0   0.0  
Level 3 | $150 senior unsecured notes        
Liabilities:        
Senior notes 0.0   $ 0.0  
Level 3 | $100 Series A Notes        
Liabilities:        
Senior notes $ 0.0