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Summary of Significant Accounting Policies, Stock-Based Compensation (Details) - General and Administrative Expense [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock-Based Compensation [Abstract] |  |  |
Compensation expense related to equity compensation plans | $ 24.1 | $ 9.9 | $ 26.6
Reversal of compensation expense for certain performance based awards no longer expected to vest | $ 0.0 | $ 4.3 | $ 0.0

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