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Fair Value of Financial Instruments Fair Value of Financial Instruments - Assets and Liabilities Carrying at Fair Value Measured on a Recurring Basis (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Sep. 30, 2015
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 266.2 | $ 465.2 | $ 447.9 | $ 643.2
Debt | [1],[2] | 6,032.5 | 5,525.8 |  |
Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed loans | [1] | 1.7 | 33.3 |  |
Total debt | [1],[2] |  | 29.9 |  |
Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total debt | [1],[2] | 6,191.3 | 5,700.1 |  |
Reported Value Measurement [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed loans | [1] | 1.7 | 33.3 |  |
Total debt | [1],[2] | 6,032.5 |  |  |
Estimate of Fair Value Measurement [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Asset-backed loans | [1] | 1.7 | 33.3 |  |
Total debt | [1],[2] | 6,191.3 | 5,730.0 |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, Fair Value Disclosure, Recurring |  | 2.9 | 8.7 |  |
Liabilities, Fair Value Disclosure, Recurring |  | 10.8 | 3.2 |  |
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, Fair Value Disclosure, Recurring |  | 0.0 | 0.0 |  |
Liabilities, Fair Value Disclosure, Recurring |  | 0.0 | 0.0 |  |
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, Fair Value Disclosure, Recurring |  | 0.0 | 0.0 |  |
Liabilities, Fair Value Disclosure, Recurring |  | 0.0 | 0.0 |  |
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Assets, Fair Value Disclosure, Recurring |  | 2.9 | 8.7 |  |
Liabilities, Fair Value Disclosure, Recurring |  | $ 10.8 | $ 3.2 |  |
[1] | The carrying value of cash and cash equivalents, trade receivables, accounts payable and accrued investment income approximate fair value due to their short duration and, accordingly, they are not presented in the tables above.
[2] | The fair value of debt set forth above is generally based on quoted or observed market prices.

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