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Debt - LT Debt (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 2,696,334 | $ 2,380,575 |
Accounts receivable, net | 6,746,687 | 6,161,418 |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 93,827 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | 500,737 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three | 461,573 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 299,611 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 248,852 |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 1,185,561 |  |
Redemption of Notes, Principal Amount |  | 250,000 |
Net proceeds from note offering | 0 | 688,162 | $ 0
Loss on prepayment of debt | 0 | 2,943 | 0
Investment Income, Interest and Dividend | 18,680 | 6,301 | 5,552
Interest Paid | 141,816 | 133,390 | $ 120,477
Asset securitization program [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Prior Maximum Borrowing Capacity | 900,000 |  |
Long-term debt | $ 460,000 | 75,000 |
Debt Instrument, Interest Rate, Effective Percentage | 1.31% |  |
Accounts receivable, net | $ 2,045,464 | $ 1,871,831 |
Asset Securitization Program Interest Rate Spread At End of Period | 0.40% |  |
Asset Securitization Program Facility Fee | 0.40% |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 910,000 |  |
3.375% notes, due 2015 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.375% | 3.375% |
6.875% senior debentures, due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 199,348 | $ 198,886 |
Debt Instrument, Fair Value | $ 212,500 | 218,000 |
Debt Instrument, Interest Rate, Stated Percentage | 6.875% |  |
3.00% notes, due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 299,013 | 298,197 |
Debt Instrument, Fair Value | $ 303,500 | 303,000 |
Debt Instrument, Interest Rate, Stated Percentage | 3.00% |  |
6.00% notes, due 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 299,183 | 298,932 |
Debt Instrument, Fair Value | $ 325,500 | 330,000 |
Debt Instrument, Interest Rate, Stated Percentage | 6.00% |  |
5.125% notes, due 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 248,843 | 248,566 |
Debt Instrument, Fair Value | $ 265,500 | 267,500 |
Debt Instrument, Interest Rate, Stated Percentage | 5.125% |  |
notes due in 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 345,776 | 345,061 |
Debt Instrument, Fair Value | $ 349,500 | 343,000 |
Debt Instrument, Face Amount |  | $ 350,000 |
Debt Instrument, Interest Rate, Stated Percentage | 3.50% | 3.50% |
4.50% notes, due 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 296,646 | $ 296,194 |
Debt Instrument, Fair Value | $ 305,500 | 309,000 |
Debt Instrument, Interest Rate, Stated Percentage | 4.50% |  |
notes due in 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 344,625 | 344,092 |
Debt Instrument, Fair Value | $ 345,000 | 336,000 |
Debt Instrument, Face Amount |  | $ 350,000 |
Debt Instrument, Interest Rate, Stated Percentage | 4.00% | 4.00% |
7.50% senior debentures, due 2027 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 198,514 | $ 198,366 |
Debt Instrument, Fair Value | $ 238,000 | 238,000 |
Debt Instrument, Interest Rate, Stated Percentage | 7.50% |  |
Interest rate swaps designated as fair value hedges [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 152 | 711 |
Other obligations with various interest rates and due dates [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 4,234 | 4,570 |
Uncommitted Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 100,000 |  |
Commercial Paper [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 1,200,000 |  |
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Prior Maximum Borrowing Capacity | 1,500,000 |  |
Long-term debt | $ 0 | $ 72,000 |
Debt Instrument, Interest Rate, Effective Percentage | 1.99% |  |
Asset Securitization Program Interest Rate Spread At End of Period | 1.18% |  |
Asset Securitization Program Facility Fee | 0.20% |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 1,800,000 |  |

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