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Long-Term Debt - Commercial Paper (Details) - USD ($) | Jul. 31, 2015 | Feb. 28, 2014 | Dec. 31, 2020 | Dec. 31, 2019 | Oct. 18, 2019
--- | --- | --- | --- | --- | ---
United States | Commercial Paper |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowing capacity under credit facility |  |  |  |  | $ 1,800,000,000
United States | Maximum | Commercial Paper |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maturity period of debt |  | 397 days |  |  |
Europe | Commercial Paper |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maturity period of debt | 183 days |  |  |  |
Carrying Value | United States |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Commercial paper |  |  | $ 0 | $ 317,000,000 |
Carrying Value | Europe |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Commercial paper |  |  | $ 0 | $ 376,946,000 |

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