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Financial Instruments, Risk Management and Fair Value Measurements - Narrative (Details) MMBTU in Millions | Mar. 31, 2019 USD ($) MMBTU | Dec. 31, 2018 USD ($)
--- | --- | ---
Derivative [Line Items] |  |
Estimated fair value of debt | $ 3,175,800,000 | $ 2,715,200,000
Carrying value of debt | 3,138,800,000 | $ 2,692,700,000
Designated as Cash Flow Hedges | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Derivative notional amount | $ 974,000,000 |
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 | $ 7,600,000 |
Not Designated as Hedging Instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Derivative notional amount | 1,153,000,000 |
Designated as Cash Flow Hedges | Designated as Cash Flow Hedges |  |
Derivative [Line Items] |  |
Cumulative changes in net gain (loss) from cash flow hedges | (6,200,000) |
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 | 13,800,000 |
Designated as Cash Flow Hedges | Designated as Cash Flow Hedges | Interest rate contracts |  |
Derivative [Line Items] |  |
Derivative notional amount | $ 500,000,000.0 |

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