Consolidated Statement of Changes in Shareholder's Equity - 6 months ended Dec. 31, 2016 - 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	11.8		11.8
Payments Related to Tax Withholding for Share-based Compensation	0.5		0.5
Net Income (Loss) Attributable to Parent	22.0			22.0
Other comprehensive income/(loss), net of tax	(47.0)				(47.0)
Ending Balance at Dec. 31, 2016	588.0	$ 1.2	$ 1,987.8	(1,048.3)	$ (352.7)
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)