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Financial Instruments, Risk Management and Fair Value Measurements - Narrative (Details) MMBTU in Millions | Sep. 30, 2018 USD ($) MMBTU | Dec. 31, 2017 USD ($)
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Derivative [Line Items] |  |
Estimated fair value of debt | $ 2,767,700,000 | $ 3,250,600,000
Carrying value of debt | 2,742,700,000 | $ 3,185,600,000
Designated as Cash Flow Hedges | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Derivative notional amount | $ 671,400,000 |
Designated as Cash Flow Hedges | Energy contracts |  |
Derivative [Line Items] |  |
Nonmonetary notional amount of price risk cash flow hedge (in mmBTUs) | MMBTU | 0.0 |
Designated as Cash Flow Hedges | Foreign Currency and Energy Contracts |  |
Derivative [Line Items] |  |
Cumulative changes in net gain (loss) from cash flow hedges | $ 5,400,000 |
Not Designated as Hedging Instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Derivative notional amount | 1,071,100,000 |
Designated as Cash Flow Hedges | Designated as Cash Flow Hedges |  |
Derivative [Line Items] |  |
Cumulative changes in net gain (loss) from cash flow hedges | 500,000 |
Designated as Cash Flow Hedges | Designated as Cash Flow Hedges | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Cumulative changes in net gain (loss) from cash flow hedges | 4,900,000 |
Designated as Cash Flow Hedges | Designated as Cash Flow Hedges | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative notional amount | $ 200,000,000 |

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