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Long-Term Debt (Narrative) (Details) $ in Millions |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 02, 2020 USD ($) | Dec. 31, 2021 USD ($) | Nov. 15, 2021 USD ($) | Dec. 31, 2020 USD ($) | Nov. 15, 2020 USD ($) | Sep. 01, 2020 USD ($) | Jun. 22, 2020 USD ($) | Aug. 26, 2019 USD ($) | Aug. 28, 2018 USD ($) | Dec. 19, 2016 USD ($) | Sep. 23, 2016 USD ($) | Dec. 07, 2015 USD ($) | Nov. 21, 2012 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding letters of credit |  | $ 84.9 |  |  |  |  |  |  |  |  |  |  |
Credit facility | Unsecured credit facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding borrowings |  | 470.0 |  | $ 1,620.0 |  |  |  |  |  |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  | $ 7,500.0 |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage (as a percent) |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Senior notes | Senior Notes Due June 2030 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  | $ 600.0 |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 2.00% |  |  |  |  |  |
Senior notes | Senior Notes Due August 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 300.0 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 0.45% |  |  |  |  |  |  |
Senior notes | Senior Notes Due September 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 700.0 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Senior notes | Senior Notes Due September 2027 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 700.0 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 1.40% |  |  |  |  |  |  |
Senior notes | Senior Notes Due February 2031 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 1,000.0 |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 1.75% |  |  |  |  |  |  |
Senior notes | Senior Notes Due 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  | $ 500.0 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 2.35% |  |  |  |  |
Senior notes | Senior Notes Due 2029 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  | $ 700.0 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 2.95% |  |  |  |  |
Senior notes | Senior Notes Due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  | $ 700.0 |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 3.65% |  |  |  |
Senior notes | Senior Notes Due 2028 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  | $ 800.0 |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 4.20% |  |  |  |
Senior notes | Senior Notes 2021 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  | $ 500.0 |  |  |  |  |  |  | $ 500.0 |  |  |
Interest rate (as a percent) |  |  | 2.80% |  |  |  |  |  |  | 2.80% |  |  |
Senior notes | Senior Notes 2026 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  | $ 700.0 |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 3.80% |  |  |
Senior notes | Senior Notes 2020 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  | $ 600.0 |  |  |  |  |  |  | $ 600.0 |
Interest rate (as a percent) |  |  |  |  | 3.00% |  |  |  |  |  |  | 3.00% |
Senior notes | Senior Notes 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  | $ 300.0 |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 3.85% |
Senior notes | Senior Notes 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 500.0
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 3.125%
JPMORGAN CHASE BANK N.A. | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt term (in years) | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) | $ 3,000.0 |  |  |  |  |  |  |  |  |  | $ 2,500.0 |  |
Potential increase limit | $ 500.0 |  |  |  |  |  |  |  |  |  |  |  |
Total Debt to Total Capital Ratio, minimum required | 0.65 |  |  |  |  |  |  |  |  |  |  |  |
JPMORGAN CHASE BANK N.A. | Letter of credit |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity (up to) | $ 150.0 |  |  |  |  |  |  |  |  |  |  |  |

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