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Financial Instruments - Balance Sheet (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015
Derivatives, Fair Value [Line Items] |  |
Gain (loss) expected to be reclassified in one year or less | $ 0.7 |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedges, before tax | 0.6 | $ 10.1
Foreign currency |  |
Derivatives, Fair Value [Line Items] |  |
Gain (loss) expected to be reclassified in one year or less | 1.4 |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedges, before tax | 1.4 | (0.1)
Foreign currency | Prepayments and other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 4.7 | 2.7
Foreign currency | Accounts payable and accrued expenses |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | 4.8 | 8.7
Commodity contracts |  |
Derivatives, Fair Value [Line Items] |  |
Gain (loss) expected to be reclassified in one year or less | (0.7) |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedges, before tax | (0.7) | (2.1)
Commodity contracts | Prepayments and other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 0.0 | 0.0
Commodity contracts | Accounts payable and accrued expenses |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | 3.9 | 10.4
Interest rate swaps | Other non-current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 8.6 | 0.0
Interest rate swaps | Accounts payable and accrued expenses |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liabilities | 0.0 | 2.7
Net investment hedge |  |
Derivatives, Fair Value [Line Items] |  |
Gain (loss) expected to be reclassified in one year or less | 0.0 |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedges, before tax | 12.3 | 12.2
Foreign currency denominated debt designated as a net investment hedge [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Accumulated other comprehensive income (loss), cumulative change in foreign currency denominated debt, before tax | $ (12.4) | $ 0.1

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