Summary of Significant Accounting Policies - Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Summary of Significant Accounting Policies
Capitalized deferred leasing cost	$ 43.1	$ 51.8	$ 42.8
Deferred leasing costs	220.5	257.0
Accumulated amortization, deferred leasing costs and intangibles	558.3	514.3
Amortization expense on deferred leasing costs	$ 76.8	$ 79.2	$ 83.4