Stock-Based Compensation - Schedule of Incentive Awards (Details) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares
Weighted- Average Grant Date Fair Value
Aggregate intrinsic values of stock options exercised | $	$ 10.8	$ 30.8
Closing stock price (in dollars per share) | $ / shares	$ 226.09	$ 226.09
Outstanding vested and currently exercisable stock options (in shares)	1,100,000	1,100,000
Exercisable stock options, aggregate intrinsic value | $	$ 118.1	$ 118.1
Exercisable stock options, weighted average exercise price (in dollars per share) | $ / shares	$ 118.00	$ 118.00
Exercisable stock options, weighted average remaining contractual life		4 years 9 months 18 days
Stock options outstanding, weighted-average remaining contractual life		6 years 2 months 12 days
Stock Options
Number of Options
Beginning balance (in shares)	1,999,647	2,180,621
Granted (in shares)	32,136	32,136
Exercise of stock options (in shares)	(97,529)	(278,303)
Expired/forfeited (in shares)	(1,247)	(1,447)
Ending balance (in shares)	1,933,007	1,933,007
Weighted- Average Exercise Price
Beginning balance (in dollars per share) | $ / shares	$ 135.69	$ 132.68
Granted (in dollars per share) | $ / shares	224.23	224.23
Exercise of stock options (in dollars per share) | $ / shares	116.33	105.26
Expired/forfeited (in dollars per share) | $ / shares	198.30	198.30
Ending balance (in dollars per share) | $ / shares	$ 138.10	$ 138.10
Time-based Restricted Stock Units
Restricted Stock Units
Beginning balance of RSUs (in shares)	679,654	682,684
Granted RSUs (in shares)	253,579	264,012
Vesting of restricted stock units (in shares)	(36,296)	(40,985)
Expired/forfeited RSUs (in shares)	(12,964)	(21,738)
Ending balance of RSUs (in shares)	883,973	883,973
Weighted- Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 146.77	$ 146.05
Granted (in dollars per share) | $ / shares	205.69	205.93
Vesting of Restricted Stock Units (in dollars per share) | $ / shares	94.56	101.88
Expired/forfeited (in dollars per share) | $ / shares	169.62	166.34
Ending balance (in dollars per share) | $ / shares	$ 165.48	$ 165.48
Restricted stock units expected to vest (in shares)	800,000	800,000
Restricted stock units, aggregate intrinsic value | $	$ 187.7	$ 187.7
Performance-based Restricted Stock Units
Restricted Stock Units
Beginning balance of RSUs (in shares)	158,709	161,805
Granted RSUs (in shares)	96,107	96,107
Vesting of restricted stock units (in shares)	0	0
Expired/forfeited RSUs (in shares)	(204)	(3,300)
Ending balance of RSUs (in shares)	254,612	254,612
Weighted- Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 152.37	$ 152.21
Granted (in dollars per share) | $ / shares	203.98	203.98
Vesting of Restricted Stock Units (in dollars per share) | $ / shares	0	0
Expired/forfeited (in dollars per share) | $ / shares	170.16	145.44
Ending balance (in dollars per share) | $ / shares	$ 171.84	$ 171.84
Restricted stock units expected to vest (in shares)	200,000	200,000
Restricted stock units, aggregate intrinsic value | $	$ 53.7	$ 53.7