Consolidated Statement of Changes in Shareholder's Equity - 9 months ended Mar. 31, 2017 - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Jun. 30, 2016	$ 635.9	$ 1.2	$ 1,976.5	$ (1,036.1)	$ (305.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity compensation	16.4		16.4
Payments Related to Tax Withholding for Share-based Compensation	(2.8)		(2.8)
Net Income (Loss) Attributable to Parent	48.0			48.0
Other comprehensive income/(loss), net tax	(20.6)				(20.6)
Ending Balance at Mar. 31, 2017	642.7	$ 1.2	$ 1,990.1	(1,022.3)	$ (326.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-16 [Member]	$ (34.2)			$ (34.2)