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Quarterly Financial Summary (Unaudited) - Schedule of Quarterly Financial Summary (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |
Significant legal settlements charge | $ 7.1 | $ 30.0 | $ 5.0 | $ 6.0 | $ 3.5
Non-deductible for income tax purposes |  | $ 23.3 |  |  |

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- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
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