Items Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Millions, unless otherwise specified |
Sep. 30, 2012
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Dec. 31, 2011
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | |||||||
Fair Value Interest Rate Swaps(1) | $ 13.7 | $ 14.8 | |||||
Fair Value, Measurements, Recurring [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | |||||||
Fair Value Interest Rate Swaps(1) | 13.7 | [1] | |||||
Notes, due 2014(1) | (288.7) | [1] | |||||
Deferred Compensation Plan(2) | (16.2) | [2] | |||||
Total | (291.2) | ||||||
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | |||||||
Fair Value Interest Rate Swaps(1) | 0 | [1] | |||||
Notes, due 2014(1) | 0 | [1] | |||||
Deferred Compensation Plan(2) | 0 | [2] | |||||
Total | 0 | ||||||
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | |||||||
Fair Value Interest Rate Swaps(1) | 13.7 | [1] | |||||
Notes, due 2014(1) | (288.7) | [1] | |||||
Deferred Compensation Plan(2) | (16.2) | [2] | |||||
Total | (291.2) | ||||||
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | |||||||
Fair Value Interest Rate Swaps(1) | 0 | [1] | |||||
Notes, due 2014(1) | 0 | [1] | |||||
Deferred Compensation Plan(2) | 0 | [2] | |||||
Total | $ 0 | ||||||
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