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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, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share [Abstract]                      
Net loss attributable to common and participating preferred stockholders $ (143.1) $ (75.6) $ (228.3) $ (109.8) $ (6.3) $ 49.0 $ (87.6) $ (39.0) $ (556.8) $ (83.9) $ (94.2)
Participating shares at end of period:                      
Common shares outstanding                 197,106 196,878 138,876
Preferred shares (as-converted basis)                 0 0 61,987
Total                 197,106 196,878 200,863
Percentage of loss allocated to:                      
Common shares                 100.00% 100.00% 100.00%
Preferred shares (a)                 0.00% 0.00% 0.00%
Net loss attributable to common shares - basic and diluted                 $ (556.8) $ (83.9) $ (94.2)
Dilutive adjustments to loss attributable to common shares from assumed conversion of preferred shares, net of tax:                      
Weighted-average common shares outstanding - basic and diluted                 198,142 162,941 139,856
Net loss per common share attributable to controlling interest:                      
Basic (in dollars per share) $ (0.73) $ (0.38) $ (1.16) $ (0.56) $ (0.03) $ 0.28 $ (0.63) $ (0.28) $ (2.81) $ (0.51) $ (0.67)
Earnings Per Share, Diluted $ (0.73) $ (0.38) $ (1.16) $ (0.56) $ (0.03) $ 0.28 $ (0.63) $ (0.28) $ (2.81) $ (0.51) $ (0.67)