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Financial Instruments, Risk Management and Fair Value Measurements Narrative (Details) MMBTU in Millions, $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 USD ($) MMBTU | Dec. 31, 2015 USD ($)
Derivative [Line Items] |  |
Estimated fair value of debt | $ 2,155.8 | $ 2,214.0
Carrying value of debt | 2,042.1 | $ 2,148.9
Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Cash flow hedge gain (loss) to be reclassified within 12 months | 3.5 |
Cash flow hedge gain (loss) to be reclassified after 12 months | 0.0 |
Designated as Hedging Instrument | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Derivative notional amount | $ 310.0 |
Designated as Hedging Instrument | Energy contracts |  |
Derivative [Line Items] |  |
Nonmonetary notional amount of price risk cash flow hedge | MMBTU | 1.3 |
Designated as Hedging Instrument | Foreign Currency and Energy Contracts |  |
Derivative [Line Items] |  |
Cumulative changes in net gain (loss) from cash flow hedges | $ 3.5 |
Not Designated as Hedging Instruments | Foreign exchange contracts |  |
Derivative [Line Items] |  |
Derivative notional amount | 1,630.0 |
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 | (3.2) |
Designated as Cash Flow Hedges | Designated as Hedging Instrument | Energy contracts |  |
Derivative [Line Items] |  |
Cumulative changes in net gain (loss) from cash flow hedges | $ (0.3) |

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