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Fair Value Measurements - Offsetting Derivative Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2013
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Fair Value Disclosures [Abstract] |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 31.9 | $ 26.3 | $ 25.1
Derivative Asset, Offset Amount, Gross | 18.2 | 2.1 | 6.4
Derivative Asset | 13.7 | 24.2 | 18.7
Derivative Liability, Fair Value, Gross Liability | (61.3) | (57.5) | (87.1)
Derivative Liability, Offset Amount, Gross | 18.2 | 2.1 | 6.4
Derivative Liability | $ 43.1 | $ 55.4 | $ 80.7

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