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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Non-cash Investing and Financing Activities | Non-cash investing and financing activities are summarized as follows (in millions):
| For the Year Ended December 31, |
| 2017 |  |  | 2016 |  |  | 2015 |
Accounts payable related to construction in progress | $ | 13.4 |  |  | $ | 13.3 |  |  | $ | 31.6 |
Dividends declared |  | 78.5 |  |  |  | 75.2 |  |  |  | 68.6 |
Assumption of buildings due to lease termination |  | 8.6 |  |  |  | — |  |  |  | — |
Casualty insurance receivable and reduction of real estate assets, net related to hurricane casualty |  | 65.9 |  |  |  | — |  |  |  | — |
Redemption of OP Units |  | — |  |  |  | — |  |  |  | 18.3 |
Mortgages assumed from acquisitions |  | — |  |  |  | — |  |  |  | 33.7 |
Elimination of a previously held equity interest |  | — |  |  |  | — |  |  |  | 1.4 |
Estimated Useful Lives of Assets | Depreciation and amortization is recorded on a straight-line basis over the estimated useful lives of the assets as follows:
Buildings | Useful lives, 20 to 31.5 years
Building improvements and fixtures | Useful lives, ranging from 5 to 20 years
Tenant improvements | Shorter of economic life or lease terms
Schedule of Fee and Other Income | Fee and Other Income was composed of the following (in thousands):
| For the Year Ended December 31, |
| 2017 |  |  | 2016 |  |  | 2015 |
Management and other fee income | $ | 33,641 |  |  | $ | 36,298 |  |  | $ | 32,971 |
Ancillary and other property income |  | 16,819 |  |  |  | 18,678 |  |  |  | 19,038 |
Lease termination fees |  | 10,505 |  |  |  | 3,512 |  |  |  | 2,774 |
Other |  | 170 |  |  |  | 80 |  |  |  | 565 |
Total fee and other income | $ | 61,135 |  |  | $ | 58,568 |  |  | $ | 55,348 |

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