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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 6 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
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 $ (0.30) $ (0.24) $ 0.88 $ (0.30)  
Weighted Average Number of Shares Outstanding, Diluted 199,981 201,062 199,579 201,370  
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent       $ (50.1)  
Net income (loss) attributable to common and participating preferred stockholders $ (82.1) $ (24.7) $ 130.1 (58.6)  
Net Income (Loss) Attributable to Parent (82.1) (24.7) 130.1 (58.6)  
Income (Loss) from Continuing Operations Attributable to Parent $ (21.3) $ 24.5 $ (46.8) $ 2.7  
Participating shares at end of period:          
Weighted-average common shares outstanding - basic 199,981 198,521 199,579 198,068  
Net (loss) income per common share attributable to controlling interest:          
Basic (in dollars per share) $ (0.41) $ (0.12) $ 0.65 $ (0.30)  
Income (Loss) from Continuing Operations, Per Diluted Share (0.11) 0.12 (0.23) 0.01  
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share (0.30) (0.24) 0.88 (0.31)  
Earnings Per Share, Diluted (0.41) (0.12) 0.65 (0.29)  
Income (Loss) from Continuing Operations, Per Basic Share $ (0.11) $ 0.12 $ (0.23) $ 0.01  
Stock option awards [Member]          
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   1,040   1,172  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,820   1,708    
Restricted stock awards [Member]          
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]          
Incremental Common Shares Attributable To Conversion Of Restricted Stock Units   1,501   2,130  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 393   846    
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 235   177    
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]          
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]          
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent $ (60.8) $ (49.2)      
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     $ 176.9 $ (61.3)