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Consolidated Statements of Stockholder's Equity (Unaudited) (Parenthetical) - shares shares in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Stockholders' Equity [Roll Forward] |  |  |  |
Exercise of employee stock options (in shares) | 0.0 | 0.1 | 0.2 | 0.2
Business acquisitions (in shares) |  |  |  | 1.4

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