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Debt, Interest Income, Expense and Other Finance Costs - Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jul. 31, 2019
Debt Instrument [Line Items] |  |  |
Expiration period | 1 year |  |
Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Amount outstanding | $ 0 | $ 55,000,000.0 |
Unused portion of facility | 1,300,000,000 | 1,200,000,000 |
Letters of credit and bankers' acceptances |  |  |
Debt Instrument [Line Items] |  |  |
Amount outstanding | 3,400,000 | 4,300,000 |
Other uncommitted credit lines |  |  |
Debt Instrument [Line Items] |  |  |
Letters of credit, outstanding amount | 328,400,000 | 375,200,000 |
Credit Facility | Amended credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Borrowing capacity | 200,000,000.0 |  |
Maximum additional borrowings available at the entity's request subject to satisfaction of certain conditions | 400,000,000.0 |  |
Credit Facility | Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Borrowing capacity |  |  | $ 1,300,000,000
Long-term debt | 0 | 55,000,000.0 |
Term Loans |  |  |
Debt Instrument [Line Items] |  |  |
Amount of term loan outstanding | $ 503,200,000 | 515,600,000 |
Term Loans | Base rate |  |  |
Debt Instrument [Line Items] |  |  |
Basis points added to reference rate | 0.75% |  |
Term Loans | Eurodollar |  |  |
Debt Instrument [Line Items] |  |  |
Basis points added to reference rate | 1.75% |  |
Term Loans | Term Loans |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 503,200,000 | $ 515,600,000 | $ 525,000,000.0

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