v3.26.1
Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Nov. 07, 2024
8.25 Percent Note      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-term debt, face amount $ 74.3    
2.25 Percent Convertible Note      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-term debt, face amount     $ 402.5
0.0 Percent Convertible Note      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-term debt, face amount     $ 805.0
Senior Notes [Member] | 2.25 Percent Convertible Note      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt, long-term and short-term, combined carrying value 392.3 $ 391.2  
Long-term debt, fair value 798.5 1,080.4  
Long-term debt, face amount 402.5 402.5  
Senior Notes [Member] | 0.0 Percent Convertible Note      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Debt, long-term and short-term, combined carrying value 785.3 783.7  
Long-term debt, fair value 833.1 1,089.8  
Long-term debt, face amount $ 805.0 $ 805.0