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Debt - LT Debt (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Loss on extinguishment of debt | $ 58,800 | $ 0 | $ 59,545 | $ 0
Long-term debt |  | 3,239,115 | 2,933,045 |
Accounts receivable, net |  | 8,945,463 | 8,125,588 |
Proceeds from note offering, net |  | 0 | 986,203 | 0
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months |  | 245,203 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  | 1,019,711 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  | 130,578 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four |  | 347,288 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five |  | 297,622 |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five |  | 1,443,722 |  |
Investment Income, Interest and Dividend |  | 47,860 | 31,156 | 18,084
Interest Paid |  | $ 213,913 | 156,974 | $ 141,816
Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.18% |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 2.37% |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 2,000,000 |  |
Line of Credit Facility, Prior Maximum Borrowing Capacity |  | 1,800,000 |  |
Asset securitization program [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 810,000 | 490,000 |
Debt Instrument, Interest Rate, Effective Percentage |  | 2.91% |  |
Asset Securitization Program Prior Maximum Capacity |  | $ 910,000 |  |
Asset Securitization Program Facility Fee |  | 0.40% |  |
Asset Securitization Program Interest Rate Spread At End of Period |  | 0.40% |  |
Accounts receivable, net |  | $ 2,754,400 | $ 2,270,500 |
Line of Credit Facility, Maximum Borrowing Capacity |  | 1,200,000 |  |
Senior Debentures Due 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.875% |
3.00% Notes, Due 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Fair Value |  | 0 | $ 300,500 |
6.00% Notes, Due 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Fair Value |  | 214,500 | $ 224,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 6.00% |
Long-term debt |  | 209,147 | $ 208,971 |
5.125% Notes, Due 2021 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Fair Value |  | 134,500 | $ 139,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.125% |
Long-term debt |  | 130,546 | $ 130,400 |
3.50% Notes, Due 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Fair Value |  | 345,000 | 355,000 |
Long-term debt |  | 347,288 | 346,518 |
4.50% Notes, Due 2023 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Fair Value |  | 303,500 | 315,500 |
Long-term debt |  | 297,622 | 297,122 |
3.25% Notes, Due 2024 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Fair Value |  | 467,000 | $ 491,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.25% |
Long-term debt |  | 494,091 | $ 493,161 |
Debt Instrument, Face Amount |  |  | 500,000 |
Proceeds from note offering, net |  |  | 493,810 |
4.00% Notes, Due 2025 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Fair Value |  | 340,500 | 356,500 |
Long-term debt |  | 345,762 | 345,182 |
7.50% Senior Debentures, Due 2027 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Fair Value |  | 128,000 | $ 138,500 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 7.50% |
Long-term debt |  | 109,776 | $ 109,694 |
3.875% Notes, Due 2028 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Fair Value |  | 458,500 | $ 501,000 |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.875% |
Long-term debt |  | 494,095 | $ 493,563 |
Debt Instrument, Face Amount |  |  | 500,000 |
Proceeds from note offering, net |  |  | 494,625 |
Other obligations with various interest rates and due dates [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Other Notes Payable, Noncurrent |  | $ 788 | $ 18,434 |
3.00% Notes, Due 2018 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.00% |  |
Debt Instrument, Face Amount |  | $ 300,000 |  |
Revolving Credit Facility [Member] | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Facility Fee |  | 0.20% |  |

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