Leases (Balance Sheet Information, Leases) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Mar. 31, 2023
Operating Leases
Operating Lease, Right-of-Use Asset	$ 388.8	$ 169.0
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other assets	Other assets
Operating Leases, Liabilities, current	$ 53.4	$ 47.4
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other accrued liabilities	Other accrued liabilities
Operating Leases, Liabilities, non-current	$ 385.1	$ 159.2
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Operating Lease, Liability	$ 438.5	$ 206.6
Operating leases, weighted average remaining lease term	9 years	5 years 7 months 6 days
Operating leases, weighted average discount rate, percent	5.24%	3.81%