Segment Information - Reconciliation of Earnings / (Loss) from Continuing Operations to Ebitda (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting [Abstract]
Earnings from continuing operations	$ 17.4	$ 30.6	$ 22.0	$ 42.4
Depreciation and amortization	35.5	35.2	71.3	70.7
Interest expense, net	22.8	22.3	44.9	45.0
Income tax (benefit)/expense	9.5	9.2	9.7	11.2
Noncontrolling interest	0.0	0.1	0.0	0.3
EBITDA from continuing operations	$ 85.2	$ 97.4	$ 147.9	$ 169.6