v3.26.1
Reclassifications out of AOCI (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Statement [Line Items]        
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax [1] $ (1.1) $ (0.6) $ (0.7) $ 0.0
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax (112.0) (291.8) (327.9) (320.7)
Accumulated Other Comprehensive Income (Loss), Net of Tax (113.1) (292.3) (328.7) $ (320.7)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax (181.8) (9.2) 7.2  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax [1] 0.2 (0.4) (0.6)  
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax (181.6) (9.6) 6.6  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (2.4) 26.7 (1.4)  
Total other comprehensive (loss) income attributable to shareholders (179.2) (36.3) 7.9  
Accumulated Translation Adjustment [Member]        
Statement [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 2.0 (27.0) 0.0  
Total other comprehensive (loss) income attributable to shareholders 179.7 36.2 (7.2)  
Accumulated Defined Benefit Plans Adjustment [Member]        
Statement [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [1] 0.4 0.3 1.4  
Total other comprehensive (loss) income attributable to shareholders [1] $ (0.6) $ 0.1 $ (0.7)  
[1] mortization (gain) of defined benefit plan costs is reported in the Interest and miscellaneous income line of our Consolidated Statements of Income.