Fair Value Disclosure (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) Instrument	Dec. 31, 2022 USD ($) Instrument	Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net operating assets and facilities	$ 9,411.2	$ 8,250.3
Derivative Liability	18.5	12.1
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	1.2
Asset Impairment Charges	1.5	48.9	$ 2.4
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	18.5
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	8.0	12.1
Portfolio Management [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges	1.2	34.3	$ 0.0
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	0.8	$ 38.8
Interest Rate Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	$ 8.0
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)	(1)