v3.26.1
Derivative Instruments and Fair Value Accounting Interest Rate Hedges (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Derivative [Line Items]                
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 1,145.7 $ 1,257.8 $ 1,145.7 $ 1,257.8 $ 1,145.7 $ 1,145.3 $ 1,299.7 $ 1,307.2
Unrealized gains/(losses) on derivative financial instruments                
Derivative [Line Items]                
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 9.3   9.3     $ (2.8)    
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]                
Derivative [Line Items]                
Derivative Asset 6.6   6.6          
Derivative Liability 0.0   0.0          
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net [1] (2.1)   (2.1)          
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 $ (2.4) 0.2 $ (4.5)        
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 (7.1)   (7.1)          
Designated as Hedging Instrument [Member] | Open Interest Rate Swaps                
Derivative [Line Items]                
Derivative, Notional Amount $ 763.5   $ 763.5          
[1] Based on the fair value of open hedges as of June 30, 2026.