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Financial Instruments, Risk Management and Fair Value Measurements - Fair Value (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Other | $ 28.9 | $ 25.3
Total assets | 28.9 | 25.3
Liabilities |  |
Other | 37.1 | 30.5
Total liabilities | 37.1 | 30.5
Quoted Prices in Active Markets for Identical Assets (Level 1) | Energy contracts |  |
Assets |  |
Derivatives | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign exchange contracts |  |
Assets |  |
Derivatives | 0.0 | 0.0
Liabilities |  |
Derivative Liabilities | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Other | 0.0 | 0.0
Total assets | 2.0 | 6.4
Liabilities |  |
Other | 1.3 | 0.6
Total liabilities | 1.9 | 9.5
Significant Other Observable Inputs (Level 2) | Energy contracts |  |
Assets |  |
Derivatives | 0.2 | 2.0
Significant Other Observable Inputs (Level 2) | Foreign exchange contracts |  |
Assets |  |
Derivatives | 1.8 | 4.4
Liabilities |  |
Derivative Liabilities | 0.6 | 8.9
Significant Unobservable Inputs (Level 3) |  |
Assets |  |
Other | 0.0 | 0.0
Total assets | 0.0 | 0.0
Liabilities |  |
Other | 0.0 | 0.0
Total liabilities | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Energy contracts |  |
Assets |  |
Derivatives | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Foreign exchange contracts |  |
Assets |  |
Derivatives | 0.0 | 0.0
Liabilities |  |
Derivative Liabilities | 0.0 | 0.0
Estimate of Fair Value Measurement |  |
Assets |  |
Other | 28.9 | 25.3
Total assets | 30.9 | 31.7
Liabilities |  |
Other | 38.4 | 31.1
Total liabilities | 39.0 | 40.0
Estimate of Fair Value Measurement | Energy contracts |  |
Assets |  |
Derivatives | 0.2 | 2.0
Estimate of Fair Value Measurement | Foreign exchange contracts |  |
Assets |  |
Derivatives | 1.8 | 4.4
Liabilities |  |
Derivative Liabilities | $ 0.6 | $ 8.9

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