Stock Incentive Plans - Stock appreciation rights activity (Details) - SARs $ / shares in Units, $ in Millions	12 Months Ended
	Jun. 30, 2018 USD ($) $ / shares shares
Number of Shares
Beginning balance, outstanding (in shares) | shares	6,533,406
Granted (in shares) | shares	907,626
Exercised (in shares) | shares	(1,351,120)
Canceled (in shares) | shares	(43,031)
Ending balance, outstanding (in shares) | shares	6,046,881
Exercisable (in shares) | shares	4,168,672
Weighted-Average Exercise Price
Beginning balance, outstanding (in USD per share) | $ / shares	$ 94.18
Granted (in USD per share) | $ / shares	158.79
Exercised (in USD per share) | $ / shares	78.61
Canceled (in USD per share) | $ / shares	146.84
Ending balance, outstanding (in USD per share) | $ / shares	106.98
Exercisable (in USD per share) | $ / shares	$ 92.74
Weighted Average Remaining Contractual Term and Aggregate Intrinsic Value
Outstanding, weighted average remaining contractual term	5 years 9 months 18 days
Exercisable, weighted average remaining contractual term	4 years 7 months 6 days
Outstanding, aggregate intrinsic value | $	$ 298.1
Exercisable, aggregate intrinsic value | $	$ 263.1