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Financial Instruments and Fair Value Measurements - Narrative (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) swap | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment balances | $ 4,300,000 | $ 2,800,000 |
Gain (loss) related to hedge ineffectiveness | 0 | 0 | $ 0
Accumulated unrealized gains (losses), net of income taxes | (4,100,000) | $ 8,900,000 |
Amount expected to be reclassified from other comprehensive loss into earnings | $ 2,800,000 |  |
Interest Rate Swaps |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Number of additional forward interest rate swaps | swap | 18 |  |
Notional value | $ 546,200,000 |  |
Weighted average derivative interest rate | 2.20% |  |
Forward Interest Rate Swaps |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Number of additional forward interest rate swaps | swap | 8 |  |
Notional value | $ 450,000,000.0 |  |
Weighted average derivative interest rate | 1.70% |  |

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