Long-Term Debt - Mortgage Facilities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Outstanding debt	$ 1,878.0	$ 1,629.2
Revolving Mortgage Facility
Debt Instrument [Line Items]
Maximum credit available	350.0
Current borrowing capacity	$ 335.7
Line of credit basis spread on variable rate, increase (decrease) (as a percent)	(1.68%)
Outstanding debt	$ 205.0
Mortgage facilities
Debt Instrument [Line Items]
Outstanding debt	$ 570.4	$ 402.1