Commitments and Contingencies - Narrative (Details) € in Millions, $ in Millions	1 Months Ended		12 Months Ended
	Dec. 31, 2017 EUR (€)	Mar. 31, 2014 EUR (€)	Jun. 30, 2018 USD ($) triggering_event	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 EUR (€)
Leases, Operating [Abstract]
Rent expense | $			$ 8.2	$ 8.4	$ 8.3
Standby letters of credit | $			$ 3.5
Legal Matters
Matters that might have a material adverse effect on financial position, results of operations or cash flows | triggering_event			0
Customer Claim
Legal Matters
Judgment issued	€ 3.5	€ 1.9
Damages, plus interest, with the possibility of additional damages to be determined						€ 1.7
Costs and Legal Fees [Member] | Customer Claim
Legal Matters
Judgment issued	€ 0.2