Consolidated Statements of Comprehensive Income / (Loss) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 109.8	$ 111.2	$ 210.3
Other comprehensive income/(loss), net of tax
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(31.9)	(118.8)	(144.0)
Defined benefit pension plan	13.0	(9.1)	(6.4)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	10.5	0.0	0.0
Deferred compensation	0.0	(3.8)	0.6
Other comprehensive income/(loss), net of tax	(8.4)	(131.7)	(149.8)
Comprehensive income/(loss)	101.4	(20.5)	60.5
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	0.0	(0.3)	(1.9)
Comprehensive income/(loss) attributable to Catalent	$ 101.4	$ (20.2)	$ 62.4