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Borrowings (Details) € in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 USD ($)
Letters of Credit [Abstract] |  |  |
Letters of credit outstanding | $ 144,500 |  |
Maturities of Long-term Debt [Abstract] |  |  |
2017 | 0 |  |
2018 | 340,369 |  |
2019 | 449,200 |  |
2020 | 0 |  |
2021 | 0 |  |
2022 and thereafter | 2,154,091 |  |
Total future maturities | 2,943,660 |  |
Debt Instrument [Line Items] |  |  |
Short-term Debt | 0 |  | $ 350,402
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Net | 13,000 |  | 14,900
Short-term borrowings [Abstract] |  |  |
Commercial paper | 220,318 |  | 230,700
Total short-term debt | 220,318 |  | 581,102
Long-term borrowings [Abstract] |  |  |
Long-term Debt | 2,943,660 |  | 3,336,713
Long-term Debt, Current Maturities | 0 |  | 350,011
Total long-term debt | 2,943,660 |  | 2,986,702
Unamortized discount | $ 15,800 |  | 17,600
Line of Credit Facility [Abstract] |  |  |
Line of credit facility, interest rate description | At the Company's election, loans under the Credit Agreement will bear interest at a base rate plus an applicable margin. |  |
Line of credit facility, covenant terms | the Credit Agreement requires the Company to pay a facility fee and imposes various restrictions on the Company such as, among other things, the requirement for the Company to maintain an interest coverage ratio of consolidated EBITDA to consolidated net interest expense of greater than or equal to 3.0 to 1 |  |
Line of credit facility, covenant compliance | 9.6 to 1.0 |  |
Note due 2018 [Member] |  |  |
Long-term borrowings [Abstract] |  |  |
Long-term Debt | $ 0 |  | 349,918
Debt instrument, stated interest rate (in hundredths) | 5.45% | 5.45% |
Debt Instrument, Term | 10 years |  |
Debt instruments, maturity date | Mar. 15, 2018 |  |
Face amount of notes | $ 350,000 |  |
Note due 2020 [Member] |  |  |
Long-term borrowings [Abstract] |  |  |
Long-term Debt | $ 339,657 |  | 354,349
Debt instrument, stated interest rate (in hundredths) | 2.125% | 2.125% |
Debt Instrument, Term | 7 years |  |
Debt instruments, maturity date | Dec. 01, 2020 |  |
Face amount of notes | € |  | € 300,000 |
Note due 2021 [Member] |  |  |
Long-term borrowings [Abstract] |  |  |
Long-term Debt | $ 449,200 |  | 448,831
Debt instrument, stated interest rate (in hundredths) | 4.30% | 4.30% |
Debt Instrument, Term | 10 years |  |
Debt instruments, maturity date | Mar. 01, 2021 |  |
Face amount of notes | $ 450,000 |  |
Note due 2025 [Member] |  |  |
Long-term borrowings [Abstract] |  |  |
Long-term Debt | $ 395,368 |  | 394,695
Debt instrument, stated interest rate (in hundredths) | 3.15% | 3.15% |
Debt Instrument, Term | 10 years |  |
Debt instruments, maturity date | Nov. 15, 2025 |  |
Face amount of notes | $ 400,000 |  |
Note due 2026 [Member] |  |  |
Long-term borrowings [Abstract] |  |  |
Long-term Debt | $ 672,103 |  | 701,058
Debt instrument, stated interest rate (in hundredths) | 1.25% | 1.25% |
Debt Instrument, Term | 10 years |  |
Debt instruments, maturity date | Nov. 09, 2026 |  |
Face amount of notes | € |  | € 600,000 |
Debentures due 2028 [Member] |  |  |
Long-term borrowings [Abstract] |  |  |
Long-term Debt | $ 199,054 |  | 198,954
Debt instrument, stated interest rate (in hundredths) | 6.65% | 6.65% |
Debt Instrument, Term | 30 years |  |
Debt instruments, maturity date | Jun. 01, 2028 |  |
Face amount of notes | $ 200,000 |  |
Debenture due 2035 [Member] |  |  |
Long-term borrowings [Abstract] |  |  |
Long-term Debt | $ 295,811 |  | 295,561
Debt instrument, stated interest rate (in hundredths) | 5.375% | 5.375% |
Debt Instrument, Term | 30 years |  |
Debt instruments, maturity date | Oct. 15, 2035 |  |
Face amount of notes | $ 300,000 |  |
Note due 2038 [Member] |  |  |
Long-term borrowings [Abstract] |  |  |
Long-term Debt | $ 247,827 |  | 247,713
Debt instrument, stated interest rate (in hundredths) | 6.60% | 6.60% |
Debt Instrument, Term | 30 years |  |
Debt instruments, maturity date | Mar. 15, 2038 |  |
Face amount of notes | $ 250,000 |  |
Note due 2041 [Member] |  |  |
Long-term borrowings [Abstract] |  |  |
Long-term Debt | $ 343,877 |  | 343,600
Debt instrument, stated interest rate (in hundredths) | 5.375% | 5.375% |
Debt Instrument, Term | 30 years |  |
Debt instruments, maturity date | Mar. 01, 2041 |  |
Face amount of notes | $ 350,000 |  |
Other long term debt instruments [Member] |  |  |
Long-term borrowings [Abstract] |  |  |
Long-term Debt | $ 763 |  | $ 2,034

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