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Earnings Per Share - Summary of Basic and Diluted EPS (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Document Fiscal Year Focus | 2017 |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share | $ 1.19 | $ (0.06) |
Weighted Average Number of Shares Outstanding, Diluted | 199,185 | 197,507 |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  | $ (2.5) |
Net income (loss) attributable to common and participating preferred stockholders | $ 212.2 | (33.9) |
Net Income (Loss) Attributable to Parent | 212.2 | (33.9) |
Income (Loss) from Continuing Operations Attributable to Parent | $ (25.5) | $ (21.8) |
Participating shares at end of period: |  |  |
Weighted-average common shares outstanding - basic | 199,185 | 197,507 |
Net income (loss) per common share attributable to controlling interest: |  |  |
Basic (in dollars per share) | $ 1.06 | $ (0.17) |
Income (Loss) from Continuing Operations, Per Diluted Share | (0.13) | (0.11) |
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share | 1.19 | (0.06) |
Earnings Per Share, Diluted | 1.06 | (0.17) |
Income (Loss) from Continuing Operations, Per Basic Share | $ (0.13) | $ (0.11) |
Stock option awards [Member] |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 1,567 | 1,303 |
Restricted stock awards [Member] |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 1,326 | 2,822 |
HGI [Member] |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Document Fiscal Year Focus | 2016 |  |
HGI [Member] | Warrant [Member] |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | $ 13.13 |  | $ 13.13
Discontinued Operations, Held-for-sale [Member] | HGI [Member] |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |
Net Income (Loss) Attributable to Parent | $ 237.7 | $ (12.1) |

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