Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Jun. 30, 2012
Y
Sep. 30, 2011
Jul. 09, 2010
$150 senior unsecured notes
     
Liabilities:      
Debt issued $ 150.0 $ 150.0 $ 150.0
Term of debt issued (in years) 10    
Stated interest rate (as a percent) 5.50%    
Carrying Value
     
Assets:      
Cash and cash equivalents 16.0    
Equity investments 3.0    
Investments in rabbi trust 5.2    
Derivative instruments 0.3    
Liabilities:      
$150 senior unsecured notes 148.6    
Level 1
     
Assets:      
Cash and cash equivalents 16.0    
Equity investments 2.0    
Investments in rabbi trust 5.2    
Liabilities:      
$150 senior unsecured notes 154.4    
Level 2
     
Assets:      
Derivative instruments 0.3    
Level 3
     
Assets:      
Equity investments $ 1.0