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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
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  | $ (20.6) | $ (1.6) | $ (242.1)
Income (Loss) from Continuing Operations, Per Basic Share | $ 0.05 | $ (0.01) | $ (0.06) | $ (0.09) | $ (0.23) | $ 0.27 | $ (0.02) | $ (0.04) | $ (0.10) | $ (0.01) | $ (1.22)
Income (Loss) from Continuing Operations, Per Diluted Share | 0.05 | (0.01) | (0.06) | (0.09) | (0.23) | 0.27 | (0.02) | (0.04) | (0.10) | (0.01) | (1.22)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share | (0.18) | 0.02 | (0.35) | 1.15 | 0.19 | (0.93) | (0.11) | (0.13) | 0.63 | (0.99) | (1.59)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share | $ (0.18) | $ 0.02 | $ (0.35) | $ 1.15 | $ 0.19 | $ (0.94) | $ (0.11) | $ (0.13) | $ 0.63 | $ (0.99) | $ (1.59)
Net Income (Loss) Attributable to Parent | $ (26.2) | $ 2.1 | $ (82.1) | $ 212.2 | $ (7.3) | $ (132.9) | $ (24.7) | $ (33.9) | $ 106.0 | $ (198.8) | $ (556.8)
Net income (loss) attributable to controlling interest |  |  |  |  |  |  |  |  | $ 106.0 | $ (198.8) | $ (556.8)
Dilutive adjustments to income (loss) attributable to common shares from assumed conversion of preferred shares, net of tax: |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding - basic and diluted |  |  |  |  |  |  |  |  | 199,990 | 198,374 | 198,142
Net income (loss) per common share attributable to controlling interest: |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic | $ (0.13) | $ 0.01 | $ (0.41) | $ 1.06 | $ (0.04) | $ (0.67) | $ (0.13) | $ (0.17) | $ 0.53 | $ (1.00) | $ (2.81)
Earnings Per Share, Diluted | $ (0.13) | $ 0.01 | $ (0.41) | $ 1.06 | $ (0.04) | $ (0.66) | $ (0.13) | $ (0.17) | $ 0.53 | $ (1.00) | $ (2.81)
HGI | Discontinued Operations, Held-for-sale [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  | $ 126.6 | $ (197.2) | $ (314.7)
Restricted stock awards |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  | 466 | 1,914 | 2,667
Stock option awards |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  | 1,727 | 1,300 | 1,334
Warrant [Member] |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  | 154 | 1,200 | 1,800

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