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Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2023
Accounting Policies [Abstract]  
Schedule of Other Property and Estimated Useful Lives of Property Estimated useful lives of property are as follows:
ClassificationRange of Life (in years)
Building and improvements
10 to 40
Leasehold improvements
5 to 10 (lesser of useful life or lease term)
Water, power and sewer systems
5 to 50
Machinery and equipment
2 to 35
Other property improvements
3 to 35
Real estate property, net as of December 31, 2023 and 2022, includes the following (in millions):
20232022
Land$781.1 $780.0 
Buildings736.6 719.6 
Other property improvements91.3 99.3 
Subtotal1,609.0 1,598.9 
Accumulated depreciation(227.3)(202.3)
Real estate property, net$1,381.7 $1,396.6 
Schedule of Interest and Other Income (Expense)
Interest and other income (expense), net for the years ended December 31, 2023, 2022, and 2021, included the following (in millions):
202320222021
Pension and post-retirement benefit (expense)$(0.5)$(0.6)$(3.0)
Interest income0.4 0.3 1.0 
Reclassification of interest rate derivative gain (loss) from Accumulated Other Comprehensive Income (Loss)(2.7)0.5 — 
Other income (expense), net0.1 0.2 0.3 
Interest and other income (expense), net$(2.7)$0.4 $(1.7)