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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
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent | $ 28.8 | $ (47.2)
Weighted Average Number of Shares Outstanding, Diluted | 202,328 | 199,185
Income (Loss) from Continuing Operations, Per Basic Share | $ 0.14 | $ (0.24)
Income (Loss) from Continuing Operations, Per Diluted Share | 0.14 | (0.24)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share | 2.37 | 1.30
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share | $ 2.39 | $ 1.30
Net Income (Loss) Attributable to Parent | $ 507.4 | $ 212.2
Net income attributable to controlling interest | $ 507.4 | $ 212.2
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 | 200,576 | 199,185
Net income per common share attributable to controlling interest: |  |
Earnings Per Share, Basic | $ 2.53 | $ 1.06
Earnings Per Share, Diluted | $ 2.51 | $ 1.06
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 | $ 454.5 | $ 229.3
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 | $ 478.6 | $ 259.4
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 |  | 1,326
Incremental Common Shares Attributable To Conversion Of Restricted Stock Units | 89 |
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 |  | 1,567
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements | 1,562 |
Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants | 101 |
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 |  | 104

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