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Temporary Equity, Equity and Dividends (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 01, 2023
Jan. 03, 2023
Nov. 06, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dividends Payable [Line Items]                      
Preferred and participating dividends       $ 8.7     $ 8.7     $ 25.9 $ 25.6
Redeemable non-controlling interest, Redemption period       60 days              
Adjustment of redeemable non-controlling interest       $ 5.0     $ 0.0     5.0 0.0
Dividends declared (usd per share)       $ 0.31 $ 0.29 $ 0.29 $ 0.29 $ 0.27 $ 0.27    
VeriTread                      
Dividends Payable [Line Items]                      
Non-controlling interest, percentage   4.00%                  
Securities Purchase Agreement                      
Dividends Payable [Line Items]                      
Initial conversion price (usd per share) $ 73.00                    
Anti-dilution adjustment provisions (usd per share) $ 71.58                    
Senior A Senior Preferred Shares                      
Dividends Payable [Line Items]                      
Preferred and participating dividends       $ 2.1     $ 2.0     5.9 5.5
Senior A Senior Preferred Shares | Securities Purchase Agreement                      
Dividends Payable [Line Items]                      
Initial preferred dividend, percentage 5.50%                    
Participating dividends (usd per share) $ 0.27                    
Senior A Senior Preferred Shares | Securities Purchase Agreement | Starboard Value LP and certain of its affiliates                      
Dividends Payable [Line Items]                      
Increase in preferred dividend rate in fourth anniversary, percentage 7.50%                    
Spread on variable rate, percentage 6.00%                    
Increase in preferred dividend rate in ninth anniversary, percentage 10.50%                    
Preferred Dividends on Series A Senior Preferred Shares                      
Dividends Payable [Line Items]                      
Preferred and participating dividends       $ 6.7     $ 6.7     $ 20.1 $ 20.1
Subsequent Event                      
Dividends Payable [Line Items]                      
Dividends declared (usd per share)     $ 0.31                
VeriTread                      
Dividends Payable [Line Items]                      
Remaining units ownership interest, percentage   21.00%