Derivative Instruments and Fair Value Accounting Interest Rate Hedges (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024
Derivative [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		$ 1,145.7	$ 1,299.7	$ 1,145.3	$ 1,307.2
Unrealized gains/(losses) on derivative financial instruments
Derivative [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		2.4		$ (2.8)
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Asset		2.8
Derivative Liability		1.4
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	[1]	0.6
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Location, Statement of Income, Balance [Axis]: us-gaap:InterestExpenseOperating
Derivative [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax		0.1	$ (2.1)
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Unrealized gains/(losses) on derivative financial instruments
Derivative [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		1.1
Designated as Hedging Instrument [Member] | Open Interest Rate Swaps
Derivative [Line Items]
Derivative, Notional Amount		769.5
Designated as Hedging Instrument [Member] | Pre-issuance Interest Rate Swaps
Derivative [Line Items]
Derivative, Notional Amount		$ 200.0

[1] Based on the fair value of open hedges as of March 31, 2026.