Note 4 - Fair Value Measurements - Liability Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) - Contingent Consideration [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2018	Mar. 31, 2018
Fair value at the beginning of period	$ 53.3	$ 68.4
Payments	(50.0)	(85.0)
Change in fair value of contingent consideration	0.2	20.1
Fair value at the end of period	$ 3.5	$ 3.5