Operating Assets and Facilities (Details1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total depreciation expense	$ 391.5	$ 371.3	$ 378.4
Operating Assets and Facilities
Property, Plant and Equipment [Line Items]
Total depreciation expense	385.6	365.0	371.6
Operating assets and facilities, included in depreciation expense
Property, Plant and Equipment [Line Items]
Total depreciation expense	376.3	357.5	364.4
Maintenance operating assets and facilities, included in maintenance expense
Property, Plant and Equipment [Line Items]
Total depreciation expense	9.3	7.5	7.2
Non-operating assets, included in SG&A
Property, Plant and Equipment [Line Items]
Total depreciation expense	$ 5.9	$ 6.3	$ 6.8