Long-Term Debt - Mortgage Facilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument
Long-term debt	$ 1,629.2	$ 1,622.1
Revolving Mortgage Facility
Debt Instrument
Maximum credit available	300.0
Current borrowing capacity	252.3
Long-term debt	$ 10.0
Revolving Mortgage Facility | Prime Rate
Debt Instrument
Line of credit basis spread on variable rate, increase (decrease) (as a percent)	(1.68%)
Mortgage facilities
Debt Instrument
Long-term debt	$ 402.1	$ 494.3