Fair Value Disclosure (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) Instrument	Dec. 31, 2023 USD ($) Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net operating assets and facilities	$ 10,449.7	$ 9,411.2
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	0.8
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit Risk Derivatives, at Fair Value, Net	4.0	8.0
Reported Value Measurement [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net operating assets and facilities	$ 0.4	$ 0.8
Interest Rate Contract [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Number of Instruments Held | Instrument	(4)	(4)
Interest Rate Contract [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, Number of Instruments Held | Instrument		(1)