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Financial Instruments and Fair Value Measurements - Narrative (Details) $ in Thousands, £ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 GBP (£) derivative | Jun. 30, 2021 USD ($) derivative | Dec. 31, 2020 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |
Aggregate notional amount |  |  |  |  |  | $ 2,059,700 | $ 1,541,400
Net loss from derivatives not designated in hedging relationships | $ 16,000 |  | $ 21,700 |  |  |  |
Foreign currency forwards | Designated as hedging instrument | Cash flow hedge |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of instruments | derivative |  |  |  |  | 36 | 36 |
Aggregate notional amount |  |  |  |  | £ 136.9 | $ 193,300 | 0
Currency exchange swaps | Not designated as hedging instrument |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of instruments | derivative |  |  |  |  | 1 | 1 |
Aggregate notional amount |  |  |  |  | £ 672.5 | $ 950,000 | 625,000
Interest rate swap | Designated as hedging instrument | Cash flow hedge |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of instruments | derivative |  |  |  |  | 1 | 1 |
Aggregate notional amount |  |  |  |  |  | $ 250,000 | 250,000
Interest rate swap | Interest expense |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Unrealized gains (losses) reclassified to income statement | (2,600) | $ (3,700) | (5,100) | $ (5,300) |  |  |
Interest rate swap unrealized loss expected to be reclassified within next twelve months |  |  |  |  |  | $ 10,300 |
Cross-currency swaps | Designated as hedging instrument | Cash flow hedge |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of instruments | derivative |  |  |  |  | 4 | 4 |
Aggregate notional amount |  |  |  |  |  | $ 166,400 | $ 166,400
Cross-currency swaps | Foreign exchange gains |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Unrealized gains (losses) reclassified to income statement | $ (200) | $ 800 | $ (1,400) | $ 12,200 |  |  |
Cross-currency swap unrealized gains expected to be reclassified within next twelve months |  |  |  |  |  | $ 1,800 |

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- Definition Amount of realized and unrealized loss of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL109998890-113959 + Details
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