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Stock Transactions And Stock-Based Compensation Stock Transactions And Stock-Based Compensation (Summary of Share Activity) (Details) - shares shares in Millions |  | 12 Months Ended
--- | --- | ---
Mar. 01, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Preferred stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, beginning of period |  | 1.7 | 0.0 | 0.0
Issuance of stock |  | 1.7 | 1.7 | 0.0
Balance, end of period |  | 3.4 | 1.7 | 0.0
Common stock |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Balance, beginning of period |  | 835.5 | 817.9 | 812.5
Issuance of stock | 12.1 | 10.9 | 12.1 | 0.0
Common stock-based award activity |  | 4.5 | 4.6 | 4.6
Common stock issued in connection with acquisitions |  | 0.0 | 0.0 | 0.2
Common stock issued in connection with LYONs’ conversions |  | 0.4 | 0.9 | 0.6
Balance, end of period |  | 851.3 | 835.5 | 817.9

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