Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Details)

v2.4.0.6
Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Jul. 09, 2010
$150 senior unsecured notes
     
Financial assets and liabilities at carrying value and fair value      
Long-term debt, principal $ 150 $ 150 $ 150
Liabilities:      
Stated interest rate (as a percent) 5.50%    
Term of debt issued 10 years    
Carrying Value
     
Assets:      
Cash and cash equivalents 20.2 115.5  
Equity investments 2.5 3.6  
Investments in rabbi trust 5.5 5.2  
Derivative instruments   0.4  
Carrying amount of private equity limited partnerships for which fair value is not readily available 13.3 13.8  
Liabilities:      
Revolving credit facility 123.0 283.0  
$150 senior unsecured notes 148.6 148.5  
Derivative instruments 0.4    
Level 1
     
Assets:      
Cash and cash equivalents 20.2 115.5  
Equity investments 1.5 2.6  
Investments in rabbi trust 5.5 5.2  
Liabilities:      
$150 senior unsecured notes 165.6 157.6  
Level 2
     
Assets:      
Derivative instruments   0.4  
Liabilities:      
Revolving credit facility 123.0 277.9  
Derivative instruments 0.4    
Level 3
     
Assets:      
Equity investments $ 1.0 $ 1.0