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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Capital in Excess of Par Value
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Treasury Stock
Noncontrolling Interests
Number of Common Shares Outstanding, beginning balance (in shares) at Dec. 31, 2023   50.1          
Balance at beginning of period at Dec. 31, 2023 $ 696.7 $ 0.5 $ 415.8 $ (0.5) $ 254.5 $ (0.6) $ 27.0
Number of Treasury Shares Outstanding, beginning balance (in shares) at Dec. 31, 2023           0.1  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 1.3       0.0   1.3
Other comprehensive income, net of tax 1.4     1.4      
Capital distributions (2.2)           (2.2)
Stock-based compensation expense 4.0   4.0        
Restricted stock forfeited, including forfeitures due to net share settlement of income taxes (in shares)   (0.1)       0.1  
Restricted stock forfeited, including forfeitures due to net share settlement of income taxes (0.8)         $ (0.8)  
Issuance of common stock pursuant to omnibus incentive plan (in shares)   0.2          
Number of Common Shares Outstanding, ending balance (in shares) at Jun. 30, 2024   50.2          
Balance at end of period at Jun. 30, 2024 700.4 $ 0.5 419.8 0.9 254.5 $ (1.4) 26.1
Number of Treasury Shares Outstanding, ending balance (in shares) at Jun. 30, 2024           0.2  
Number of Common Shares Outstanding, beginning balance (in shares) at Mar. 31, 2024   50.2          
Balance at beginning of period at Mar. 31, 2024 700.0 $ 0.5 417.6 0.8 254.7 $ (1.3) 27.7
Number of Treasury Shares Outstanding, beginning balance (in shares) at Mar. 31, 2024           0.2  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 0.4       (0.2)   0.6
Other comprehensive income, net of tax 0.1     0.1      
Capital distributions (2.2)           (2.2)
Stock-based compensation expense 2.2   2.2        
Restricted stock forfeited, including forfeitures due to net share settlement of income taxes (0.1)         $ (0.1)  
Number of Common Shares Outstanding, ending balance (in shares) at Jun. 30, 2024   50.2          
Balance at end of period at Jun. 30, 2024 700.4 $ 0.5 419.8 0.9 254.5 $ (1.4) 26.1
Number of Treasury Shares Outstanding, ending balance (in shares) at Jun. 30, 2024           0.2  
Number of Common Shares Outstanding, beginning balance (in shares) at Dec. 31, 2024   50.4          
Balance at beginning of period at Dec. 31, 2024 548.9 $ 0.5 426.6 (0.2) 98.3 $ (1.7) 25.4
Number of Treasury Shares Outstanding, beginning balance (in shares) at Dec. 31, 2024           0.2  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 24.1       23.0   1.1
Other comprehensive income, net of tax 0.2     0.2      
Capital distributions (1.0)           (1.0)
Stock-based compensation expense 7.0   7.0        
Restricted stock forfeited, including forfeitures due to net share settlement of income taxes (in shares)   (0.1)       0.2  
Restricted stock forfeited, including forfeitures due to net share settlement of income taxes (1.3)         $ (1.3)  
Issuance of common stock pursuant to omnibus incentive plan (in shares)   0.3          
Number of Common Shares Outstanding, ending balance (in shares) at Jun. 30, 2025   50.6          
Balance at end of period at Jun. 30, 2025 577.9 $ 0.5 433.6 0.0 121.3 $ (3.0) 25.5
Number of Treasury Shares Outstanding, ending balance (in shares) at Jun. 30, 2025           0.4  
Number of Common Shares Outstanding, beginning balance (in shares) at Mar. 31, 2025   50.6          
Balance at beginning of period at Mar. 31, 2025 568.3 $ 0.5 429.8 (0.2) 116.1 $ (3.0) 25.1
Number of Treasury Shares Outstanding, beginning balance (in shares) at Mar. 31, 2025           0.4  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income (loss) 5.7       5.2   0.5
Other comprehensive income, net of tax 0.2     0.2      
Capital distributions (0.1)           (0.1)
Stock-based compensation expense 3.8   3.8        
Number of Common Shares Outstanding, ending balance (in shares) at Jun. 30, 2025   50.6          
Balance at end of period at Jun. 30, 2025 $ 577.9 $ 0.5 $ 433.6 $ 0.0 $ 121.3 $ (3.0) $ 25.5
Number of Treasury Shares Outstanding, ending balance (in shares) at Jun. 30, 2025           0.4