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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, 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