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Debt - Long Term Debt Outstanding (Details) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 EUR (€) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 | Jun. 30, 2015 EUR (€)
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Total |  | $ 4,249,054,000 |  | $ 3,159,336,000 |  |
Current maturities of long-term debt |  | (500,000,000) |  | 0 |  |
Long-term debt, excluding current maturities |  | 3,749,054,000 |  | 3,159,336,000 |  |
7.456% Senior Notes Due 2018 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total |  | $ 500,000,000 |  | $ 500,000,000 |  |
Senior notes, interest rate | 7.456% | 7.456% | 7.456% | 7.456% |  |
Senior unsecured notes principal amount |  | $ 500,000,000 |  |  |  |
5.95% Senior Notes Due 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total |  | $ 747,829,000 |  | $ 747,020,000 |  |
Senior notes, interest rate | 5.95% | 5.95% | 5.95% | 5.95% | 5.95% |
Senior unsecured notes principal amount |  | $ 750,000,000 |  |  |  |
2.5% Senior Notes Due 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total |  | $ 774,882,000 |  | $ 677,503,000 |  |
Senior notes, interest rate | 2.50% | 2.50% | 2.50% | 2.50% | 2.50% | 2.50%
Senior unsecured notes principal amount | € | € 650,000,000 |  | € 650,000,000 |  |  | € 650,000,000
4.5% Senior Notes Due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total |  | $ 495,159,000 |  | $ 494,472,000 |  |
Senior notes, interest rate | 4.50% | 4.50% | 4.50% | 4.50% | 4.50% |
Senior unsecured notes principal amount |  | $ 500,000,000 |  |  |  |
5.0% Senior Notes Due 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total |  | $ 741,319,000 |  | $ 740,341,000 |  |
Senior notes, interest rate | 5.00% | 5.00% | 5.00% | 5.00% | 5.00% |
Senior unsecured notes principal amount |  | $ 750,000,000 |  |  |  |
3.8% Senior Notes Due 2028 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Total |  | $ 989,865,000 |  | $ 0 |  |
Senior notes, interest rate | 3.80% | 3.80% | 3.80% | 3.80% |  |
Senior unsecured notes principal amount |  | $ 1,000,000,000 |  |  |  |

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