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Consolidated Statements of Stockholder's Equity (Parenthetical) - shares shares in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Stockholders' Equity [Roll Forward] |  |
Exercise of employee stock options (in shares) | 0.5 | 1.2
Acquisitions (in shares) | 1.5 | 0.2

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