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Financial Instruments, Risk Management and Fair Value Measurements Narrative (Details) MMBTU in Millions, $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 USD ($) MMBTU | Dec. 31, 2015 USD ($)
Derivative [Line Items] |  |
Estimated fair value of debt | $ 2,194.8 | $ 2,214.0
Carrying value of debt | 2,100.4 | $ 2,148.9
Designated as Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Cash flow hedge gain (loss) to be reclassified within 12 months | 2.8 |
Cash flow hedge gain (loss) to be reclassified after 12 months | 0.0 |
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] |  |
Derivative [Line Items] |  |
Derivative notional amount | $ 419.0 |
Designated as Hedging Instrument [Member] | Energy contracts [Member] |  |
Derivative [Line Items] |  |
Nonmonetary notional amount of price risk cash flow hedge | MMBTU | 1.9 |
Designated as Hedging Instrument [Member] | Foreign Currency and Energy Contracts [Member] |  |
Derivative [Line Items] |  |
Cumulative changes in net gain (loss) from cash flow hedges | $ 2.8 |
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] |  |
Derivative [Line Items] |  |
Derivative notional amount | 1,889.0 |
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] |  |
Derivative [Line Items] |  |
Cumulative changes in net gain (loss) from cash flow hedges | 1.2 |
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Energy contracts [Member] |  |
Derivative [Line Items] |  |
Cumulative changes in net gain (loss) from cash flow hedges | $ 1.6 |

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