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Schedule III - Real Estate and Accumulated Depreciation - Reconciliations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of Real Estate      
Balance at beginning of year $ 1,658.8 $ 1,653.2 $ 1,625.4
Additions and improvements 33.0 24.5 45.4
Dispositions, retirements and other adjustments (19.9) (13.9) (17.6)
Impairment of assets (4.8) (5.0) 0.0
Balance at end of year 1,667.1 1,658.8 1,653.2
Reconciliation of Accumulated Depreciation      
Balance at beginning of year 202.3 180.5 154.4
Depreciation expense 28.8 28.6 27.3
Dispositions, retirements and other adjustments (3.8) (6.8) (1.2)
Balance at end of year $ 227.3 $ 202.3 $ 180.5