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Fair Value Measurements - Financial Assets and Liabilities that are Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Sep. 30, 2015 | Mar. 31, 2015
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Derivative financial instruments, assets |  | $ 48.6 |  | $ 67.8
Derivative financial instruments, liabilities |  | (117.1) |  | (180.8)
Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Non-qualified supplemental postretirement grantor trust investments | [1] | 31.8 | $ 30.3 | 31.8
Fair Value, Measurements, Recurring | Commodity contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Derivative financial instruments, assets |  | 37.0 | 29.0 | 22.2
Derivative financial instruments, liabilities |  | (107.4) | (169.0) | (168.3)
Fair Value, Measurements, Recurring | Foreign currency contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Derivative financial instruments, assets |  | 11.6 | 29.1 | 35.8
Derivative financial instruments, liabilities |  | (5.0) | (0.1) |
Fair Value, Measurements, Recurring | Interest rate contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Derivative financial instruments, assets |  |  |  | 0.1
Derivative financial instruments, liabilities |  | (3.4) | (10.8) | (12.5)
Fair Value, Measurements, Recurring | Cross-currency swaps |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Derivative financial instruments, assets |  |  | 0.4 | 9.7
Derivative financial instruments, liabilities |  | (1.3) |  |
Fair Value, Measurements, Recurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Non-qualified supplemental postretirement grantor trust investments | [1] | 31.8 | 30.3 | 31.8
Fair Value, Measurements, Recurring | Level 1 | Commodity contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Derivative financial instruments, assets |  | 20.3 | 17.4 | 13.9
Derivative financial instruments, liabilities |  | (59.0) | (70.0) | (64.0)
Fair Value, Measurements, Recurring | Level 1 | Foreign currency contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Derivative financial instruments, assets |  | 0.0 | 0.0 | 0.0
Derivative financial instruments, liabilities |  | 0.0 | 0.0 |
Fair Value, Measurements, Recurring | Level 1 | Interest rate contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Derivative financial instruments, assets |  |  |  | 0.0
Derivative financial instruments, liabilities |  | 0.0 | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 1 | Cross-currency swaps |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Derivative financial instruments, assets |  |  | 0.0 | 0.0
Derivative financial instruments, liabilities |  | 0.0 |  |
Fair Value, Measurements, Recurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Non-qualified supplemental postretirement grantor trust investments | [1] | 0.0 | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 2 | Commodity contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Derivative financial instruments, assets |  | 16.7 | 11.6 | 8.3
Derivative financial instruments, liabilities |  | (48.4) | (99.0) | (104.3)
Fair Value, Measurements, Recurring | Level 2 | Foreign currency contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Derivative financial instruments, assets |  | 11.6 | 29.1 | 35.8
Derivative financial instruments, liabilities |  | (5.0) | (0.1) |
Fair Value, Measurements, Recurring | Level 2 | Interest rate contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Derivative financial instruments, assets |  |  |  | 0.1
Derivative financial instruments, liabilities |  | (3.4) | (10.8) | (12.5)
Fair Value, Measurements, Recurring | Level 2 | Cross-currency swaps |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Derivative financial instruments, assets |  |  | 0.4 | 9.7
Derivative financial instruments, liabilities |  | (1.3) |  |
Fair Value, Measurements, Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Non-qualified supplemental postretirement grantor trust investments | [1] | 0.0 | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Commodity contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Derivative financial instruments, assets |  | 0.0 | 0.0 | 0.0
Derivative financial instruments, liabilities |  | 0.0 | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Foreign currency contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Derivative financial instruments, assets |  | 0.0 | 0.0 | 0.0
Derivative financial instruments, liabilities |  | 0.0 | 0.0 |
Fair Value, Measurements, Recurring | Level 3 | Interest rate contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Derivative financial instruments, assets |  |  |  | 0.0
Derivative financial instruments, liabilities |  | 0.0 | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Cross-currency swaps |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |  |  |
Derivative financial instruments, assets |  |  | $ 0.0 | $ 0.0
Derivative financial instruments, liabilities |  | $ 0.0 |  |
[1] | Consists primarily of mutual fund investments held in grantor trusts associated with non-qualified supplemental retirement plans.

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719 + Details
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