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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Aug. 31, 2017 | Aug. 31, 2016 | Aug. 31, 2015
Operating Loss Carryforwards [Line Items] |  |  |
Income (Loss) from Continuing Operations before Income Taxes, Domestic | $ 213.8 | $ 490.8 | $ 824.9
Income (Loss) from Continuing Operations before Income Taxes, Foreign | (268.7) | (70.9) | (56.7)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 0.0 | 0.0 | $ 0.0
Operating Loss Carryforwards | 689.2 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 458.1 |  |
Change in valuation allowance for deferred tax asset | 61.9 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 0.0 | 0.0 |
Other Assets [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | 0.7 | 2.5 |
Alternative Minimum Tax Credit [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 8.1 |  |
General Business Tax Credit Carryforward [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 60.0 |  |
State tax credits [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | 172.9 |  |
NCRA [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Change in valuation allowance for deferred tax asset | 26.6 |  |
NCRA [Member] | State tax credits [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward, amount | $ 172.9 | $ 133.5 |

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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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