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Financial Instruments, Risk Management and Fair Value Measurements - Narrative (Details) MMBTU in Millions, $ in Millions | Mar. 31, 2018 USD ($) MMBTU | Dec. 31, 2017 USD ($)
--- | --- | ---
Derivative [Line Items] |  |
Estimated fair value of debt | $ 3,364.7 | $ 3,250.6
Carrying value of debt | 3,322.1 | $ 3,185.6
Designated as Hedging Instrument | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Derivative notional amount | $ 352.6 |
Designated as Hedging Instrument | Energy contracts |  |
Derivative [Line Items] |  |
Nonmonetary notional amount of price risk cash flow hedge (in mmBTUs) | MMBTU | 0.0 |
Designated as Hedging Instrument | Foreign Currency and Energy Contracts |  |
Derivative [Line Items] |  |
Cumulative changes in net gain (loss) from cash flow hedges | $ 6.1 |
Not Designated as Hedging Instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Derivative notional amount | 1,628.6 |
Designated as Cash Flow Hedges | Designated as Hedging Instrument | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Cumulative changes in net gain (loss) from cash flow hedges | $ 6.1 |

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