Reclassifications out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2026	Jun. 30, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 7,197.2	$ 6,615.8
Ending balance	7,221.3	6,969.9
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1.1)	(0.6)
Other Comprehensive Income (Loss) before reclassifications	0.2	0.1
Amounts reclassified from Accumulated Other Comprehensive Loss	(0.2)	(0.1)
Net current-period Other Comprehensive Loss	0.0	0.0
Ending balance	(1.1)	(0.6)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(112.0)	(291.8)
Other Comprehensive Income (Loss) before reclassifications	(14.1)	221.8
Amounts reclassified from Accumulated Other Comprehensive Loss	0.0	0.0
Net current-period Other Comprehensive Loss	(14.1)	221.8
Ending balance	(126.2)	(69.9)
AOCI Attributable to Parent [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(113.1)	(292.3)
Other Comprehensive Income (Loss) before reclassifications	(13.9)	222.0
Amounts reclassified from Accumulated Other Comprehensive Loss	(0.2)	(0.1)
Net current-period Other Comprehensive Loss	(14.1)	221.8
Ending balance	$ (127.3)	$ (70.5)