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Debt Obligations - Senior Notes (Details) - USD ($) $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 23, 2021 | Sep. 22, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from notes offering |  |  |  | $ 1,487,450 | $ 990,130 | $ 1,487,450 | $ 990,130
Senior Notes | Senior Notes Due 2024, 2032 And 2041 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument |  | $ 1,500,000 |  |  |  |  |
Proceeds from notes offering |  | 1,480,000 |  |  |  |  |
Redemption price, percentage | 101.00% |  |  |  |  |  |
Senior Notes | Senior Notes Due October 2024 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument |  | $ 500,000 |  |  |  |  |
Interest rate |  | 0.95% |  |  |  |  |
Semi-annual interest payable |  | $ 2,375 |  |  |  |  |
Senior Notes | Senior Notes Due October 2024 | Prior to commencement date |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  | 100.00% |
Senior Notes | Senior Notes Due October 2024 | Following the commencement date |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  | 100.00% |
Senior Notes | Senior Notes Due January 2032 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument |  | $ 500,000 |  |  |  |  |
Interest rate |  | 2.35% |  |  |  |  |
Semi-annual interest payable |  | $ 5,875 |  |  |  |  |
Senior Notes | Senior Notes Due January 2032 | Prior to commencement date |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  | 100.00% |
Senior Notes | Senior Notes Due January 2032 | Following the commencement date |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  | 100.00% |
Senior Notes | Senior Notes Due October 2041 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument |  | $ 500,000 |  |  |  |  |
Interest rate |  | 3.05% |  |  |  |  |
Semi-annual interest payable |  | $ 7,625 |  |  |  |  |
Senior Notes | Senior Notes Due October 2041 | Prior to commencement date |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  | 100.00% |
Senior Notes | Senior Notes Due October 2041 | Following the commencement date |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  | 100.00% |
Senior Notes | Senior Notes Due October 2030 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument |  |  | $ 1,000,000 |  |  |  |
Interest rate | 2.90% |  |  | 2.90% |  | 2.90% |
Proceeds from notes offering |  |  | $ 986,700 |  |  |  |
Semi-annual interest payable |  | $ 14,500 |  |  |  |  |
Senior Notes | Senior Notes Due October 2030 | Prior to commencement date |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  | 100.00% |
Senior Notes | Senior Notes Due October 2030 | Following the commencement date |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  | 100.00% |

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