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Debt and Credit Facility - Credit Facility (Details) - USD ($) | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | May 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2019 | Jun. 30, 2019
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt issuance amortization |  |  | $ 70,900,000 |  | $ 83,600,000 |
Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Proceeds from borrowings on revolving loan under credit facility |  |  | 682,000,000.0 | $ 3,725,500,000 |  |
Term Loan Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Proceeds from borrowings on revolving loan under credit facility |  |  | 0 | $ 3,000,000,000.0 |  |
Line of Credit |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt issuance amortization | $ 1,750,000 |  |  |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | 3,570,000,000 |  |  |  |  | $ 3,600,000,000
Debt issuance amortization |  |  | $ 13,600,000 |  | 14,700,000 |
Extinguishment of debt, amount |  |  |  |  | 244,300,000 |
Restrictive covenants, maximum replacement financing | $ 2,000,000,000.0 |  |  |  |  |
Restrictive covenants, maximum replacement financing, term | 3 years |  |  |  |  |
Restrictive covenants, maximum transfer or assignment of securitization assets | $ 600,000,000 |  |  |  |  |
Interest coverage ratio, less than |  |  | 3.25 |  |  |
Interest rate spread on overdue principal in event of default |  |  | 2.00% |  |  |
Interest rate spread on overdue amounts in event of default |  |  | 2.00% |  |  |
Line of Credit | Revolving Credit Facility | Leverage Ratio Percent One |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, covenant, total leverage ratio, maximum |  |  | 6.75 |  |  |
Line of credit facility covenant, total indebtedness, convertible debt excluded, maximum |  |  | $ 700,000,000 |  |  |
Total leverage ratio, temporary maximum allowed, next three quarters |  |  | 4.75 |  |  |
Line of Credit | Revolving Credit Facility | Leverage Ratio Percent Two |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, covenant, total leverage ratio, maximum |  |  | 6.25 |  |  |
Total leverage ratio, temporary maximum allowed, next three quarters |  |  | 4.25 |  |  |
Line of Credit | Revolving Credit Facility | Leverage Ratio Percent Three |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Line of credit facility, covenant, total leverage ratio, maximum |  |  | 5.75 |  |  |
Total leverage ratio, temporary maximum allowed, next three quarters |  |  | 3.75 |  |  |
Line of Credit | Revolving Credit Facility | Minimum | Base Rate |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 0.00% |  | 0.00% |  |  |
Line of Credit | Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 1.00% |  | 1.00% |  |  |
Line of Credit | Revolving Credit Facility | Maximum | Base Rate |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 0.75% |  | 0.75% |  |  |
Line of Credit | Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 1.75% |  | 1.75% |  |  |
Line of Credit | Revolving Credit Facility | 2023 Tranche |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | $ 3,570,000,000 |  |  |  |  |
Line of Credit | Foreign Line of Credit |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 250,000,000.0 |  |  |
Line of Credit | Standby Letters of Credit |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  | 50,000,000.0 |  |  |
Line of Credit | Line of Credit Facility Swingline Loan Sublimit |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  | 25,000,000.0 |  |  |
Line of Credit | Term Loan Facility |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Debt issuance amortization |  | $ 34,700,000 | $ 15,300,000 |  | 19,400,000 |
Proceeds from borrowings on term loan facility |  | $ 3,000,000,000.0 |  |  |  |
Quarterly amortization payments, percent |  |  | 0.25% |  |  |
Repayments of long-term debt |  |  | $ 188,000,000.0 |  | 1,090,000,000.00 |
Loss on settlement of debt |  |  | $ 1,900,000 |  | 11,500,000 |
Proceeds from borrowings on revolving loan under credit facility |  |  |  |  | $ 500,000,000.0 |
Line of Credit | Term Loan Facility | Leverage Ratio Percent One |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Mandatory prepayment of excess cash flow, percentage |  |  | 50.00% |  |  |
Line of Credit | Term Loan Facility | Leverage Ratio Percent Two |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Mandatory prepayment of excess cash flow, percentage |  |  | 25.00% |  |  |
Line of Credit | Term Loan Facility | Leverage Ratio Percent Three |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Mandatory prepayment of excess cash flow, percentage |  |  | 0.00% |  |  |

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