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Consolidated Statements of Stockholder's Equity (Parenthetical) - shares shares in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Stockholders' Equity [Roll Forward] |  |
Exercise of employee stock options (in shares) | 0.2 | 0.3
Business acquisitions (in shares) |  | 1.4

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