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Schedule II - Condensed Financial Information of Registrant - Condensed Balance Sheet of Registrant (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash and cash equivalents | $ 270.1 | $ 465.2 | $ 643.2 | $ 673.6
Receivables, net | 285.7 | 269.4 |  |
Assets, Current | 30,036.1 | 1,823.7 |  |
Cash and cash equivalents | 2,631.7 | 2,405.3 |  |
Property, plant and equipment, net (Note 10) | 503.9 | 367.4 |  |
Total assets | 35,849.7 | 33,580.1 |  |
LIABILITIES AND EQUITY |  |  |  |
Accounts Payable, Current | 373.1 | 316.0 |  |
Interest Payable, Current | 78.0 | 68.3 |  |
Liabilities, Current | 27,645.0 | 1,241.2 |  |
Long-term debt | 5,801.9 | 5,575.4 |  |
Employee benefit obligations | 97.2 | 104.9 | 87.8 |
Deferred tax liabilities (Note 18) | 493.2 | 512.1 |  |
Other liabilities | 26.2 | 26.0 |  |
Total liabilities | 33,902.8 | 31,762.9 |  |
Stockholders’ equity: |  |  |  |
Common stock, $0.01 par; 500,000.0 thousand shares authorized; 200,624.9 thousand and 200,789.1 thousand shares issued and outstanding at September 30, 2017 and 2016, respectively. | 2.0 | 2.0 |  |
Accumulated deficit | (925.9) | (1,031.9) |  |
Accumulated other comprehensive income | 309.0 | 220.9 | (40.7) |
Total permanent equity | 1,946.9 | 1,817.2 | 1,588.1 | 2,257.0
Total liabilities and equity | 35,849.7 | 33,580.1 |  |
Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Cash and cash equivalents | 92.9 | 170.9 | $ 297.2 | $ 420.0
Receivables, net | 0.0 | 0.1 |  |
Assets, Current | 92.9 | 171.0 |  |
Cash and cash equivalents | 2,423.9 | 1,870.1 |  |
Advances to consolidated subsidiaries | 0.2 | 9.6 |  |
Deferred Tax Assets, Net, Current | 0.0 | 351.2 |  |
Property, plant and equipment, net (Note 10) | 0.8 | 1.1 |  |
Deferred charges and other assets | 0.5 | 0.6 |  |
Total assets | 2,518.3 | 2,403.6 |  |
LIABILITIES AND EQUITY |  |  |  |
Accounts Payable, Current | 0.8 | 0.2 |  |
Accrued Liabilities, Current | 36.1 | 48.2 |  |
Liabilities, Current | 36.9 | 48.4 |  |
Long-term debt | 1,718.3 | 1,711.2 |  |
Employee benefit obligations | 4.2 | 5.2 |  |
Other liabilities | 0.9 | 0.7 |  |
Total liabilities | 1,760.3 | 1,765.5 |  |
Stockholders’ equity: |  |  |  |
Common stock, $0.01 par; 500,000.0 thousand shares authorized; 200,624.9 thousand and 200,789.1 thousand shares issued and outstanding at September 30, 2017 and 2016, respectively. | 2.0 | 2.0 |  |
Additional paid-in capital | 1,372.9 | 1,447.1 |  |
Accumulated deficit | (925.9) | (1,031.9) |  |
Accumulated other comprehensive income | 309.0 | 220.9 |  |
Total permanent equity | 758.0 | 638.1 |  |
Total liabilities and equity | $ 2,518.3 | $ 2,403.6 |  |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.9) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6801-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 + Details
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- Definition Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e7018-107765 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 + Details
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