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Fair Value Measurements (Additional Information) (Detail) - Jun. 30, 2015 - USD ($) $ in Millions | Total
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Fair value of our revolving facility and senior debt | $ 873.9
Carrying value of our revolving facility and senior debt | $ 873.4
4.5% Senior Notes, due December 2020 |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Stated interest rate | 4.50%
4.2% Senior Notes, due December 2021 |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Stated interest rate | 4.20%

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