Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

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Fair Value Measurements (Details) (USD $)
In Millions
Jun. 30, 2011
Carrying Value
Jun. 30, 2011
Quoted Prices in Active Markets (Level 1)
Jun. 30, 2011
Significant Other Observable Inputs (Level 2)
Jun. 30, 2011
Significant Unobservable Inputs (Level 3)
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         $ 150.0
Assets:          
Cash and cash equivalents 198.3 198.3      
Equity investments 4.5 3.5   1.0  
Investments in rabbi trust 5.5 5.5      
Liabilities:          
Revolving credit facility 124.0   121.2    
$150 senior unsecured notes 148.5 149.3      
Derivative instruments, net $ 0.5   $ 0.5