Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

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

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

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