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Income Taxes - Reconciliation to effective income tax rate (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Income Tax Disclosure [Abstract]      
Expected income tax expense at Federal statutory rate $ (154.3) $ 74.6 $ 41.4
Valuation allowance for deferred tax assets 328.6 (47.4) 151.8
Preferred stock equity conversion feature 0.0 4.4 35.6
Effective Income Tax Rate Reconciliation, Residual Tax on Foreign Earnings, Amount 24.8 90.9 (7.0)
Foreign rate differential (29.0) (23.1) (18.8)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, oreign Jurisdictions, Amount 0.0 (7.7) 0.0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount (54.5) 0.0 0.0
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount 9.2 0.0 0.0
Gain on deconsolidation (23.3) 0.0 0.0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount 9.9 0.0 0.0
Permanent items 14.4 7.9 7.4
Exempt foreign income (4.7) (5.7) (5.9)
Unrecognized tax benefits (1.5) 2.2 4.1
Effective Income Tax Rate Reconciliation, Purchase Accounting Benefit, Amount (22.8) 0.0 0.0
State and local income taxes (7.3) 0.8 (32.2)
Outside basis difference (16.2) 0.0 0.0
Capitalized transaction costs 0.0 1.0 5.6
Other (1.7) 13.6 5.3
Reported income tax expense $ 71.6 $ 111.5 $ 187.3
Effective tax rate (16.20%) 52.30% 158.30%