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CONSOLIDATED STATEMENT OF CASH FLOWS (Parenthetical) | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
1.750% Senior Notes |  |  |
Debt instruments |  |  |
Debt interest rate (as a percent) | 1.75% | 1.75% | 1.75%

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