Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Details)

v2.3.0.15
Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Sep. 30, 2010
Sep. 30, 2011
Carrying Value
Sep. 30, 2010
Carrying Value
Sep. 30, 2011
Level 1
Sep. 30, 2010
Level 1
Sep. 30, 2011
Level 2
Sep. 30, 2010
Level 2
Sep. 30, 2011
Level 3
Sep. 30, 2010
Level 3
Sep. 30, 2011
$150 senior unsecured notes, due July 15, 2020, net of discount
Year
Jul. 09, 2010
$150 senior unsecured notes, due July 15, 2020, net of discount
Financial assets and liabilities at carrying value and fair value                      
Long-term debt, principal                     $ 150
Assets:                      
Cash and cash equivalents   115.5 98.4 115.5 98.4            
Auction rate securities 11.9   11.9       11.9        
Forethought Note     144.8           127.0    
Equity investments   3.6 3.0 2.6       1.0 3.0    
Investments in rabbi trust   5.2 5.7 5.2 5.7            
Derivative instruments   0.4       0.4          
Carrying amount of private equity limited partnerships for which fair value is not readily available   13.8 15.2                
Liabilities:                      
Revolving credit facility   283.0 255.0     277.9 241.8        
$150 senior unsecured notes   148.5 148.4 157.6 158.0            
Derivative instruments     $ 0.1       $ 0.1        
Stated interest rate (as a percent)                   5.50%  
Term of debt issued (in years)                   10