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Stock-based Compensation Plans - Allocation of Stock-Based Compensation by Functional Category (Parenthetical) (Detail) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($)
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Accelerated vesting of equity grants | $ 18.2

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- Definition Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition. + References No definition available. + Details
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