Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

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,
	2020		2019		2018
Consolidation of the net assets (excluding mortgages as disclosed   below) of previously unconsolidated joint ventures	$	272.6	$	—	$	—
Joint venture investments related to consolidation of net assets		86.4		—		—
Mortgages assumed, of previously unconsolidated joint ventures		196.6		—		—
Mortgages assumed, shopping center acquisitions		—		9.1		—
Accounts payable related to construction in progress		6.3		11.0		9.3
Assumption of buildings due to ground lease terminations		3.0		—		2.2
Dividends declared, but not paid		14.8		44.0		45.3
Contribution of net assets to RVI		—		—		663.4
Write-off of preferred share original issuance costs		—		7.2		—
Land acquired by minority interest partner		—		—		2.3
Conversion of Operating Partnership Units		—		—		0.9

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, ranging from 31.5 to 40 years
Building improvements and fixtures	Useful lives, ranging from 3 to 20 years
Tenant improvements	Shorter of economic life or lease terms