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Nature of Business and Financial Statement Presentation (Tables) | 9 Months Ended
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Sep. 30, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Non-cash Investing and Financing Activities | Non-cash investing and financing activities are summarized as follows (in millions):
| Nine Months |
| Ended September 30, |
| 2020 |  |  | 2019 |
Dividends declared, but not paid | $ | 5.1 |  |  | $ | 44.6 |
Accounts payable related to construction in progress |  | 5.1 |  |  |  | 14.9 |
Assumption of buildings due to ground lease terminations |  | 3.0 |  |  |  | — |

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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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