Property, Plant and Equipment and Other Intangibles (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Interest costs threshold for capitalization construction in process	$ 0.5
Long-term debt, weighted average interest rate, over time	4.30%	4.40%	4.40%
Property, plant and equipment	$ 8,163.9	$ 8,045.9
Depreciation expense	$ 218.7	225.2	$ 240.5
Finite-lived intangible asset, useful life	15 years
Amortization of intangible assets	$ 2.8	2.7	$ 2.7
Rights-of-way and other
Property, Plant and Equipment [Line Items]
Property, plant and equipment	532.1	524.0
Capitalized Interest | Rights-of-way and other
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 100.1	$ 98.7
Minimum
Property, Plant and Equipment [Line Items]
Finite-lived intangible asset, useful life	7 years
Maximum
Property, Plant and Equipment [Line Items]
Finite-lived intangible asset, useful life	30 years