Share-Based Compensation - Equity Incentive Plans, RSU and PSU Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Weighted Average Grant Date Fair Value
Share price (in dollars per share)	$ 89.71
Restricted Stock Units
Number of Shares
Nonvested shares at beginning of period (in shares)	8,663,602	9,848,955	11,710,924
Granted (in shares)	2,535,772	3,054,320	2,850,803
Forfeited (in shares)	(474,397)	(815,738)	(917,303)
Vested (in shares)	(2,510,781)	(3,423,935)	(3,795,469)
Nonvested shares at end of period (in shares)	8,214,196	8,663,602	9,848,955
Weighted Average Grant Date Fair Value
Nonvested shares at beginning of period (in dollars per share)	$ 58.72	$ 52.74	$ 44.51
Granted (in dollars per share)	77.28	61.76	74.00
Forfeited (in dollars per share)	64.37	55.14	50.76
Vested (in dollars per share)	48.56	45.08	43.77
Nonvested shares at end of period (in dollars per share)	$ 67.22	$ 58.72	$ 52.74
RSU Vested aggregate intrinsic value	$ 201.4	$ 256.3	$ 287.6
Total intrinsic value of awards outstanding	736.9
Unvested share-based payment awards	$ 320.3
Weighted average remaining expense recognition period (in years)	2 years 1 month 13 days
Market-based Performance Shares | Minimum
Weighted Average Grant Date Fair Value
Shares expected to received at vesting, percent	0.00%
Measurement period	2 years
Market-based Performance Shares | Maximum
Weighted Average Grant Date Fair Value
Shares expected to received at vesting, percent	200.00%
Measurement period	3 years
Performance Shares
Number of Shares
Nonvested shares at beginning of period (in shares)	380,870	257,060	172,894
Granted (in shares)	123,747	172,334	145,188
Forfeited (in shares)	(2,883)	(48,524)	(61,022)
Vested (in shares)	0	0	0
Nonvested shares at end of period (in shares)	501,734	380,870	257,060
Weighted Average Grant Date Fair Value
Nonvested shares at beginning of period (in dollars per share)	$ 69.51	$ 74.76	$ 62.85
Granted (in dollars per share)	77.61	60.88	81.51
Forfeited (in dollars per share)	100.20	66.71	57.08
Vested (in dollars per share)	0	0	0
Nonvested shares at end of period (in dollars per share)	$ 71.33	$ 69.51	$ 74.76
Total intrinsic value of awards outstanding	$ 45.0
Unvested share-based payment awards	$ 25.0
Weighted average remaining expense recognition period (in years)	2 years 1 month 17 days
Performance Shares | Minimum
Weighted Average Grant Date Fair Value
Shares expected to received at vesting, percent	0.00%
Measurement period	2 years
Performance Shares | Maximum
Weighted Average Grant Date Fair Value
Shares expected to received at vesting, percent	200.00%
Measurement period	3 years