v3.26.1
Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance $ 143.3 $ (43.0) $ 82.1 $ (92.5)
Reclassifications:        
Total other comprehensive income (loss) (2.2) 18.7 (0.6) 15.0
Ending balance 3,649.7 136.0 3,649.7 136.0
Accumulated Other Comprehensive Income (Loss)        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (29.0) (43.9) (30.7) (40.7)
Other comprehensive income (loss) before reclassifications     (1.1) 5.9
Reclassifications:        
Realized gains - net     2.0 6.2
Exchange of noncontrolling interest for Class A common stock     (2.8)  
Income taxes     (2.3) 1.1
Ending balance (33.9) (28.5) (33.9) (28.5)
Accumulated Other Comprehensive Income (Loss) | Including Tax Distribution To Parent        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (29.7) (40.8)
Reclassifications:        
Total other comprehensive income (loss)     (4.2) 13.2
Ending balance (33.9) (27.6) (33.9) (27.6)
Foreign Currency Translation        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (24.4) (39.7)
Other comprehensive income (loss) before reclassifications     (13.6) 17.3
Reclassifications:        
Realized gains - net     0.0 0.0
Exchange of noncontrolling interest for Class A common stock     (3.1)  
Income taxes     0.0 0.0
Total other comprehensive income (loss)     (16.7) 17.3
Ending balance (41.1) (22.4) (41.1) (22.4)
Defined Benefit Plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (3.6) (5.5)
Other comprehensive income (loss) before reclassifications     0.1 (0.1)
Reclassifications:        
Realized gains - net     0.0 0.0
Exchange of noncontrolling interest for Class A common stock     (0.4)  
Income taxes     0.0 0.1
Total other comprehensive income (loss)     (0.3) 0.0
Ending balance (3.9) (5.5) (3.9) (5.5)
Cash Flow Hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (1.7) 3.8
Other comprehensive income (loss) before reclassifications     12.4 (8.7)
Reclassifications:        
Realized gains - net     2.0 4.3
Exchange of noncontrolling interest for Class A common stock     0.7  
Income taxes     (2.3) 0.9
Total other comprehensive income (loss)     12.8 (3.5)
Ending balance 11.1 0.3 11.1 0.3
Available-for-sale Securities        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     0.0 0.6
Other comprehensive income (loss) before reclassifications     0.0 (2.6)
Reclassifications:        
Realized gains - net     0.0 1.9
Exchange of noncontrolling interest for Class A common stock     0.0  
Income taxes     0.0 0.1
Total other comprehensive income (loss)     0.0 (0.6)
Ending balance $ 0.0 $ 0.0 $ 0.0 $ 0.0