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Real Estate Property, Net and Other Property, Net (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Leased property - real estate	$ 1,549.7	$ 1,540.2
Accumulated depreciation	(154.4)	(127.5)
Real estate property, net	1,395.3	1,412.7
Other property	188.3	201.0
Accumulated depreciation	(77.5)	(76.6)
Other property, net	110.8	124.4
Land
Property, Plant and Equipment [Line Items]
Leased property - real estate	769.6	768.8
Other property	39.3	38.4
Buildings
Property, Plant and Equipment [Line Items]
Leased property - real estate	696.0	692.4
Other property	18.5	19.7
Asphalt plants, machinery and equipment
Property, Plant and Equipment [Line Items]
Other property	104.4	105.5
Water, power and sewer systems
Property, Plant and Equipment [Line Items]
Other property	19.7	30.6
Other property improvements
Property, Plant and Equipment [Line Items]
Leased property - real estate	84.1	79.0
Other property	$ 6.4	$ 6.8

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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