v3.26.3
ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Activity for Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
AOCI Attributable to Parent, Net of Tax            
Beginning balance $ 10,724.9 $ 10,327.5 $ 10,337.6 $ 10,606.5 $ 10,191.6 $ 10,062.9
Ending balance 10,961.5 10,724.9 10,327.5 10,205.0 10,606.5 10,191.6
Total Accumulated Other Comprehensive Loss            
AOCI Attributable to Parent, Net of Tax            
Beginning balance (214.6) (221.3) (238.3) (264.1) (254.5) (244.5)
Other comprehensive (loss) income before reclassifications 18.8 19.2 39.8 36.7 (2.7) 6.9
Amounts reclassified from accumulated other comprehensive loss (24.1) (5.7) (15.2) (15.5) (31.4) (28.9)
Deferred income tax benefit (expense) (0.3) (6.8) (7.6) (7.5) 24.5 12.0
Ending balance (220.2) (214.6) (221.3) (250.4) (264.1) (254.5)
Foreign Currency Translation Adjustments            
AOCI Attributable to Parent, Net of Tax            
Beginning balance (242.9) (229.5) (228.5) (214.1) (257.7) (274.1)
Other comprehensive (loss) income before reclassifications (3.5) (11.9) 2.0 (6.0) 39.1 16.1
Amounts reclassified from accumulated other comprehensive loss (1.7) (1.6) (1.6) (1.6) (1.5) (1.7)
Deferred income tax benefit (expense) (0.3) 0.1 (1.4) (0.4) 6.0 2.0
Ending balance (248.4) (242.9) (229.5) (222.1) (214.1) (257.7)
Unrealized (Loss) Gain on Hedges            
AOCI Attributable to Parent, Net of Tax            
Beginning balance 28.5 8.4 (9.8) (43.8) 10.1 37.7
Other comprehensive (loss) income before reclassifications 2.2 16.1 22.0 19.7 (61.8) (27.6)
Amounts reclassified from accumulated other comprehensive loss (1.8) 10.9 2.5 8.0 (10.9) (10.2)
Deferred income tax benefit (expense) (0.1) (6.9) (6.3) (6.9) 18.8 10.2
Ending balance 28.8 28.5 8.4 (23.0) (43.8) 10.1
Unrealized Loss on Available-for-sale Investments            
AOCI Attributable to Parent, Net of Tax            
Beginning balance (1.2) (1.2) (0.8) (2.1) (2.9) (4.0)
Other comprehensive (loss) income before reclassifications 20.3 15.0 15.6 22.8 20.1 18.3
Amounts reclassified from accumulated other comprehensive loss (20.6) (15.0) (16.1) (21.9) (19.0) (17.0)
Deferred income tax benefit (expense) 0.1 0.0 0.1 (0.2) (0.3) (0.2)
Ending balance (1.4) (1.2) (1.2) (1.4) (2.1) (2.9)
Unrealized Pension Credits            
AOCI Attributable to Parent, Net of Tax            
Beginning balance 1.0 1.0 0.8 (4.1) (4.0) (4.1)
Other comprehensive (loss) income before reclassifications (0.2) 0.0 0.2 0.2 (0.1) 0.1
Amounts reclassified from accumulated other comprehensive loss 0.0 0.0 0.0 0.0 0.0 0.0
Deferred income tax benefit (expense) 0.0 0.0 0.0 0.0 0.0 0.0
Ending balance $ 0.8 $ 1.0 $ 1.0 $ (3.9) $ (4.1) $ (4.0)