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Financial Instruments and Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Interest rate swaps | Interest expense |  |
Derivative [Line Items] |  |
Unrealized gains (losses) reclassified to income statement | $ 11.4 | $ 3.4
Interest rate swap unrealized loss expected to be reclassified within next twelve months | 10.3 |
Cross-currency swaps | Foreign currency and gains |  |
Derivative [Line Items] |  |
Unrealized gains (losses) reclassified to income statement | 3.6 | $ 5.5
Cross-currency swap unrealized gains expected to be reclassified within next twelve months | $ 1.0 |

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