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Stockholders' Equity and Stock-Based Compensation (Summary of Share Activity) (Details) - shares shares in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Preferred stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance, beginning of period | 1.7 | 3.4 | 3.4
Balance, end of period | 0.0 | 1.7 | 3.4
Preferred stock | Conversion of MCPS to common stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Common stock issued in connection with MCPS and LYONs conversions (in shares) | (1.7) | (1.7) | 0.0
Common stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Balance, beginning of period | 869.3 | 855.7 | 851.3
Issuance of common stock attributable to stock-based compensation | 2.6 | 2.6 | 3.4
Common stock issued in connection with acquisitions | 0.0 | 0.0 | 0.1
Balance, end of period | 880.5 | 869.3 | 855.7
Common stock | Conversion of MCPS to common stock |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Common stock issued in connection with MCPS and LYONs conversions (in shares) | 8.6 | 11.0 | 0.0
Common stock | Common stock issued in connection with LYONs’ conversions |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Common stock issued in connection with MCPS and LYONs conversions (in shares) | 0.0 | 0.0 | 0.9

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