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Stockholders' Deficit - Summarizes the Company's Pre-tax Share-based Incentive Compensation Expense and Income Tax Benefit (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Total share-based incentive compensation expense | $ 34.4 | $ 29.9 | $ 48.5
Associated tax benefits recognized | 5.8 | 4.9 | 11.8
2019 Three-year PSU Awards |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Total share-based incentive compensation expense | 4.3 | 0.0 | 0.0
2018 Three-year PSU Awards |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Total share-based incentive compensation expense | 0.2 | 2.7 | 0.0
2017 Three-year PSU Awards |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Total share-based incentive compensation expense | 0.0 | 3.7 | 9.8
2017 COO and Chief Executive Officer-Designate 2017 New Hire Equity Awards |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Total share-based incentive compensation expense | 0.2 | 0.2 | 0.1
2016 Three-year PSU Awards |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Total share-based incentive compensation expense | 0.0 | (3.0) | 2.0
2016 President & CEO Inducement Award |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Total share-based incentive compensation expense | 0.0 | 0.0 | 0.5
2015 Three-year PSU Awards |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Total share-based incentive compensation expense | 0.0 | 0.0 | (0.8)
2014 Special PSU Awards |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Total share-based incentive compensation expense | 0.0 | 0.0 | 3.2
Share-based compensation expense settled in cash |  |  | 1.0
SLO Awards |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Total share-based incentive compensation expense | 3.2 | 1.6 | 1.1
Other long-term share-based incentive compensation programs |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Total share-based incentive compensation expense | $ 26.5 | $ 24.7 | $ 32.6

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