Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Provision for income taxes	$ 161.4	$ 161.4	$ 151.8
Effective income tax rate	33.10%	34.40%	34.60%
Non-cash, nontaxable MAL investment gain	$ 3.3	$ 0.0	$ 0.0
Effective income tax rate excluding investment gain	33.70%
Increase in current year tax accrual	$ 2.2
Increase in effective tax rate related to a more favorable mix of geographical income	0.20%
Decrease in effective tax rate related to Federal research and development credits		0.34%
Increase in Cumulative Discrete Tax Benefits		0.02%
Increase in effective tax rate related to gross tax benefit		0.36%
Decrease in additional US federal Tax Expense		0.16%
Foreign earnings as a percent of total company earnings		17.00%	17.00%
Accumulated earnings attributable to foreign subsidiaries	$ 89.5	$ 79.7	$ 73.5
Deferred tax asset valuation allowances	9.3	9.8
Reserve for unrecognized tad positions	13.4	12.9	12.7
Gross decrease for prior period tax positions	2.8	9.4	5.1
Accrued interest and penalties related to uncertain tax positions	(0.2)	(0.3)	0.1
Total liability recognized	3.2	$ 3.4	$ 5.0
Foreign
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Accumulated earnings attributable to foreign subsidiaries	430.4
Net operating loss carryforwards	14.8
Foreign net operating loss carryforwards subject to expiration	1.3
Foreign net operating loss carryforwards not subject to expiration	13.5
Domestic
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Net operating loss carryforwards	$ 26.4
Earliest Tax Year | Foreign
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Expiration year of operating loss carryforwards	Dec. 31, 2018
Earliest Tax Year | Domestic
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Expiration year of operating loss carryforwards	Dec. 31, 2018
Latest Tax Year | Foreign
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Expiration year of operating loss carryforwards	Dec. 31, 2027
Latest Tax Year | Domestic
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Expiration year of operating loss carryforwards	Dec. 31, 2030
MAL
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Non-cash, nontaxable MAL investment gain	$ 9.3