Long-Term Debt - Mortgage Facilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument
Long-term debt	$ 1,852.0	$ 1,629.2
Revolving Mortgage Facility
Debt Instrument
Maximum credit available	350.0
Current borrowing capacity	$ 336.6
Line of credit basis spread on variable rate, increase (decrease) (as a percent)	1.68%
Long-term debt	$ 150.0
Mortgage facilities
Debt Instrument
Long-term debt	$ 474.8	$ 402.1