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Shareholders' Equity Shareholders' Equity (Tables) | 12 Months Ended
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Sep. 30, 2017
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income Reflected in Consolidated Statements of Permanent Equity | The cumulative amounts of the components of accumulated other comprehensive income reflected in the accompanying Consolidated Statements of Shareholders’ Equity, as of September 30, 2017, 2016 and 2015, were as follows:
|  | Unrealized Investment Gains, net |  | Non-credit Related Other-than- temporary Impairments |  | Other Unrealized Gains (Losses) — Cash Flow Hedges |  | Actuarial Adjustments to Pension Plans |  | Cumulative Translation Adjustments |  | Total
Cumulative components at September 30, 2017: |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts (after reclassification adjustments) |  | $ | 1,134.9 |  |  | $ | (2.4 | ) |  | $ | (35.4 | ) |  | $ | (58.7 | ) |  | $ | (135.1 | ) |  | $ | 903.3 |
Intangible assets adjustments |  | (298.9 | ) |  | 0.4 |  |  | — |  |  | — |  |  | — |  |  | (298.5 | )
Tax effects |  | (291.6 | ) |  | 0.2 |  |  | 9.5 |  |  | 3.6 |  |  | 3.5 |  |  | (274.8 | )
Noncontrolling interest |  | (106.5 | ) |  | — |  |  | 10.1 |  |  | 21.5 |  |  | 53.9 |  |  | (21.0 | )
|  | $ | 437.9 |  |  | $ | (1.8 | ) |  | $ | (15.8 | ) |  | $ | (33.6 | ) |  | $ | (77.7 | ) |  | $ | 309.0 |
Cumulative components at September 30, 2016: |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts (after reclassification adjustments) |  | $ | 940.5 |  |  | $ | (2.4 | ) |  | $ | 7.0 |  |  | $ | (87.7 | ) |  | $ | (164.2 | ) |  | $ | 693.2 |
Intangible assets adjustments |  | (258.6 | ) |  | 0.4 |  |  | — |  |  | — |  |  | — |  |  | (258.2 | )
Tax effects |  | (237.1 | ) |  | 0.2 |  |  | (3.8 | ) |  | 12.1 |  |  | 3.5 |  |  | (225.1 | )
Noncontrolling interest |  | (86.0 | ) |  | — |  |  | (1.7 | ) |  | 30.4 |  |  | 68.3 |  |  | 11.0 |
|  | $ | 358.8 |  |  | $ | (1.8 | ) |  | $ | 1.5 |  |  | $ | (45.2 | ) |  | $ | (92.4 | ) |  | $ | 220.9 |
Cumulative components at September 30, 2015: |  |  |  |  |  |  |  |  |  |  |  |
Gross amounts (after reclassification adjustments) |  | $ | 147.2 |  |  | $ | (1.0 | ) |  | $ | (3.0 | ) |  | $ | (48.4 | ) |  | $ | (155.7 | ) |  | $ | (60.9 | )
Intangible assets adjustments |  | (0.3 | ) |  | 0.4 |  |  | — |  |  | — |  |  | — |  |  | 0.1 |
Tax effects |  | (51.4 | ) |  | 0.2 |  |  | (0.9 | ) |  | 1.3 |  |  | 3.5 |  |  | (47.3 | )
Noncontrolling interest |  | (17.4 | ) |  | — |  |  | 1.3 |  |  | 18.6 |  |  | 64.9 |  |  | 67.4 |
|  | $ | 78.1 |  |  | $ | (0.4 | ) |  | $ | (2.6 | ) |  | $ | (28.5 | ) |  | $ | (87.3 | ) |  | $ | (40.7 | )
Schedule of Shares of Common Stock Repurchased [Table Text Block] |
|  | Shares repurchased |  | Weighted-Average Price per Share |  | Amount Repurchased
Cumulative balance through September 30, 2017 (a) |  | 6,900 |  |  | $ | 12.71 |  |  | $ | 87.7 |
Cumulative balance through September 30, 2016 (a) |  | 6,900 |  |  | $ | 12.71 |  |  | $ | 87.7 |
Cumulative balance through September 30, 2015 (a) |  | 6,900 |  |  | $ | 12.71 |  |  | $ | 87.7 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: 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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