Quarterly report pursuant to Section 13 or 15(d)

Items Measured at Fair Value on a Recurring Basis (Detail)

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Items Measured at Fair Value on a Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Interest Rate Swaps $ 12.1 [1] $ 9.7
Deferred Compensation Plan (13.9) [2]  
Total (288.9)  
Notes, due 2014
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes, due 2014 (287.1)  
Notes, due 2014 | Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes, due 2014 (287.1)  
Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred Compensation Plan (13.9) [2]  
Total (13.9)  
Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Interest Rate Swaps 12.1 [1]  
Total $ (275.0)  
[1] The fair value of our interest rate swaps, which are designated as fair value hedges, and notes are based on the present value of expected future cash flows using zero coupon rates and are classified within Level 2 of the fair value hierarchy.
[2] We maintain a deferred compensation plan that allows for certain management employees to defer the receipt of compensation (such as salary, incentive compensation and commissions) until a later date based on the terms of the plan. The liability representing benefits accrued for plan participants is valued at the quoted market prices of the participants' elections for investments. Identical instruments are traded in active markets as of June 30, 2011. As such, we have classified this liability as Level 1 within the fair value hierarchy.