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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
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Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent |  |  |  |  |  |  |  |  | $ 44.6 | $ (313.3) | $ (158.3)
Weighted Average Number of Shares Outstanding, Diluted |  |  |  |  |  |  |  |  | 201,588 | 198,142 | 162,941
Income (Loss) from Continuing Operations, Per Basic Share | $ (0.24) | $ 0.52 | $ 0.09 | $ (0.15) | $ (0.53) | $ (0.21) | $ (0.40) | $ (0.44) | $ 0.23 | $ (1.58) | $ (0.97)
Income (Loss) from Continuing Operations, Per Diluted Share | (0.24) | 0.51 | 0.09 | (0.15) | (0.53) | (0.21) | (0.40) | (0.44) | 0.22 | (1.58) | (0.97)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share | 0.20 | (1.17) | (0.22) | (0.02) | (0.20) | (0.17) | (0.76) | (0.12) | (1.21) | (1.23) | 0.46
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share | $ 0.20 | $ (1.19) | $ (0.22) | $ (0.02) | $ (0.20) | $ (0.17) | $ (0.76) | $ (0.12) | $ (1.23) | $ (1.23) | $ 0.46
Net Income (Loss) Attributable to Parent | $ (7.3) | $ (132.9) | $ (24.7) | $ (33.9) | $ (143.1) | $ (75.6) | $ (228.3) | $ (109.8) | $ (198.8) | $ (556.8) | $ (10.3)
Net loss attributable to controlling interest |  |  |  |  |  |  |  |  | $ (198.8) | $ (556.8) | $ (83.9)
Participating shares at end of period: |  |  |  |  |  |  |  |  |  |  |
Participating common shares at the end of period |  |  |  |  |  |  |  |  | 198,814 | 197,106 | 196,878
Dilutive adjustments to loss attributable to common shares from assumed conversion of preferred shares, net of tax: |  |  |  |  |  |  |  |  |  |  |
Weighted-average common shares outstanding - basic |  |  |  |  |  |  |  |  | 198,374 | 198,142 | 162,941
Net loss per common share attributable to controlling interest: |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic | $ (0.04) | $ (0.67) | $ (0.13) | $ (0.17) | $ (0.73) | $ (0.38) | $ (1.16) | $ (0.56) | $ (1.00) | $ (2.81) | $ (0.51)
Earnings Per Share, Diluted | $ (0.04) | $ (0.66) | $ (0.13) | $ (0.17) | $ (0.73) | $ (0.38) | $ (1.16) | $ (0.56) | $ (0.99) | $ (2.81) | $ (0.51)
HGI |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to controlling interest |  |  |  |  |  |  |  |  | $ (198.8) | $ (556.8) | $ (83.9)
Dilutive adjustments to loss attributable to common shares from assumed conversion of preferred shares, net of tax: |  |  |  |  |  |  |  |  |  |  |
Reversal of income related to fair value of preferred stock conversion feature |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (12.7)
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 |  |  |  |  |  |  |  |  | $ (243.4) | $ (243.5) | 74.4
Net loss attributable to controlling interest |  |  |  |  |  |  |  |  |  |  | $ 74.4
Restricted stock awards |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Incremental Common Shares Attributable To Conversion Of Restricted Stock Units |  |  |  |  |  |  |  |  | 1,914 |  |
Stock option awards |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |  |  |  |  |
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements |  |  |  |  |  |  |  |  | 1,300 |  |

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