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Financial Instruments, Risk Management and Fair Value Measurements - Narrative (Details) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Sep. 20, 2019 USD ($) | Mar. 31, 2021 USD ($) MMBTU | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Derivative [Line Items] |  |  |  |
Estimated fair value of debt |  | $ 3,833.3 |  | $ 3,640.0
Carrying value of debt |  | 3,605.8 |  | $ 3,267.8
Loss on settlement |  | (4.0) | $ (12.0) |
Designated as Cash Flow Hedges | Foreign exchange contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, notional amount |  | $ 1,598.1 |  |
Designated as Cash Flow Hedges | Energy contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Nonmonetary notional amount of price risk cash flow hedge (in mmBTUs) | MMBTU |  | 0 |  |
Designated as Cash Flow Hedges | Foreign Currency and Energy Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Net gains (losses) on cash flow hedges |  | $ 25.9 |  |
Not Designated as Hedging Instruments | Foreign exchange contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, notional amount |  | 1,790.3 |  |
Cash Flow Hedging | Designated as Cash Flow Hedges |  |  |  |
Derivative [Line Items] |  |  |  |
Net gains (losses) on cash flow hedges |  | 6.3 |  |
Cash Flow Hedging | Designated as Cash Flow Hedges | Foreign exchange contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Net gains (losses) on cash flow hedges |  | 25.9 |  |
Cash Flow Hedging | Designated as Cash Flow Hedges | Interest rate contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, notional amount |  | $ 100.0 |  |
Loss on settlement | $ 83.1 |  |  |

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