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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
Jun. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative instruments, Assets $ 83.9 $ 232.5 $ 147.6
Derivative instruments, Liabilities (120.2) (58.8) (53.6)
Fair Value, Measurements, Recurring      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Non-qualified supplemental postretirement grantor trust investments 40.8 40.8 38.4
Fair Value, Measurements, Recurring | Commodity contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative instruments, Assets 54.4 211.0 128.5
Derivative instruments, Liabilities (107.2) (43.4) (34.2)
Fair Value, Measurements, Recurring | Foreign currency contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative instruments, Assets 29.5 20.6 18.4
Derivative instruments, Liabilities (5.2) (14.4) (17.9)
Fair Value, Measurements, Recurring | Interest rate contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative instruments, Liabilities (7.8) (1.0) (1.5)
Fair Value, Measurements, Recurring | Cross-currency contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative instruments, Assets   0.9 0.7
Fair Value, Measurements, Recurring | Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Non-qualified supplemental postretirement grantor trust investments 40.8 40.8 38.4
Fair Value, Measurements, Recurring | Level 1 | Commodity contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative instruments, Assets 30.1 93.5 58.5
Derivative instruments, Liabilities (44.8) (33.6) (25.3)
Fair Value, Measurements, Recurring | Level 1 | Foreign currency contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative instruments, Assets 0.0 0.0 0.0
Derivative instruments, Liabilities 0.0 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Interest rate contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative instruments, Liabilities 0.0 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Cross-currency contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative instruments, Assets   0.0 0.0
Fair Value, Measurements, Recurring | Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Non-qualified supplemental postretirement grantor trust investments 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 [Line Items]      
Derivative instruments, Assets 24.3 117.5 70.0
Derivative instruments, Liabilities (62.4) (9.8) (8.9)
Fair Value, Measurements, Recurring | Level 2 | Foreign currency contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative instruments, Assets 29.5 20.6 18.4
Derivative instruments, Liabilities (5.2) (14.4) (17.9)
Fair Value, Measurements, Recurring | Level 2 | Interest rate contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative instruments, Liabilities (7.8) (1.0) (1.5)
Fair Value, Measurements, Recurring | Level 2 | Cross-currency contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative instruments, Assets   0.9 0.7
Fair Value, Measurements, Recurring | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Non-qualified supplemental postretirement grantor trust investments 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 [Line Items]      
Derivative instruments, Assets 0.0 0.0 0.0
Derivative 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 [Line Items]      
Derivative instruments, Assets 0.0 0.0 0.0
Derivative instruments, Liabilities 0.0 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Interest rate contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative instruments, Liabilities $ 0.0 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Cross-currency contracts      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative instruments, Assets   $ 0.0 $ 0.0