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Equity (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2025
$ / shares
shares
Sep. 30, 2025
USD ($)
item
$ / shares
shares
Sep. 30, 2024
USD ($)
$ / shares
Sep. 30, 2025
USD ($)
D
item
$ / shares
shares
Sep. 30, 2024
USD ($)
$ / shares
Feb. 04, 2025
USD ($)
Apr. 30, 2023
USD ($)
Class of Stock [Line Items]              
Number of classes of common stock | item   1   1      
Stock repurchased, amount | shares       0      
Cash dividends declared       $ 38.4 $ 38.1    
Dividends declared, per share (usd per share) | $ / shares   $ 0.177 $ 0.177 $ 0.531 $ 0.531    
401(K) Plan              
Employer gross contributions       $ 0.5 $ 0.5    
Primary sales agreement              
Class of Stock [Line Items]              
Number of shares sold | shares       0      
Maximum              
Class of Stock [Line Items]              
Amount authorized for repurchase of common stock           $ 50.0  
401(K) Plan              
Employer match as a percentage of participant's contributions       50.00%      
Maximum employer match as a percent of employee's compensation       10.00%      
Maximum | Primary sales agreement              
Class of Stock [Line Items]              
Aggregate sales price             $ 300.0
Minimum              
401(K) Plan              
Length of continuous service required for eligibility       3 months      
2009 Long Term Incentive Plan              
Class of Stock [Line Items]              
Number of shares available for issuance for future awards (in shares) | shares   761,888   761,888      
Cost not yet recognized, amount   $ 5.3   $ 5.3      
Period over which costs expected to be recognized       1 year 4 months 24 days      
Performance-based awards | Amended Caret Performance Incentive Plan              
Class of Stock [Line Items]              
Number of shares available for issuance for future awards (in shares) | shares   128,971   128,971      
Trigger at average per share price (in dollars per share) | $ / shares       $ 60      
Awards outstanding (in shares) | shares   1,371,029   1,371,029      
Number of awards outstanding of then-outstanding units (as percentage)       14.40%      
Number of awards outstanding of then-authorized units (as percentage)       11.40%      
Cost not yet recognized, amount   $ 2.1   $ 2.1      
Period over which costs expected to be recognized       1 year 6 months      
Performance-based awards | Amended Caret Performance Incentive Plan | Minimum              
Class of Stock [Line Items]              
Threshold consecutive trading days | D       30      
Directors              
Class of Stock [Line Items]              
Per share grant date fair value of awards granted during period | $ / shares $ 15.34            
Shares of common stock issued | shares 39,911            
Award vesting period 1 year            
General and Administrative Expense | Caret Units | Caret Performance Incentive Plan (the "Original Caret Performance Incentive Plan").              
Class of Stock [Line Items]              
Share-based payment arrangement, expense   $ 0.3 $ 0.3 $ 1.0 $ 0.6