Consolidated Statement of Changes in Shareholder's Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss)/Income [Member]	Noncontrolling Interest [Member]
Beginning Balance at Jun. 30, 2013	$ (410.3)	$ 0.7	$ 1,026.7	$ (1,395.3)	$ (42.8)	$ 0.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity contribution	(0.2)		0.2			(0.4)
Equity compensation	4.5		4.5
Net Income (Loss) Attributable to Parent	16.2			16.2
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest						(0.6)
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	15.6
Other comprehensive income /(loss), net of tax	18.6				18.6
Ending Balance at Jun. 30, 2014	(371.8)	0.7	1,031.4	(1,379.1)	(24.2)	(0.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity contribution	946.6	0.5	946.1
Equity compensation	9.0		9.0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	(10.3)		(10.3)
Noncontrolling Interest Ownership Changes	(1.5)		(2.5)			1.0
Net Income (Loss) Attributable to Parent	212.2			212.2
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest						(0.4)
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	211.8
Other comprehensive income /(loss), net of tax	(149.8)				(149.8)
Ending Balance at Jun. 30, 2015	634.0	1.2	1,973.7	(1,166.9)	(174.0)	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity compensation	10.8		10.8
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	(8.7)		(8.7)
Noncontrolling Interest Ownership Changes	(0.3)		(0.3)			0.0
Net Income (Loss) Attributable to Parent	111.5			111.5
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest						0.0
Other comprehensive income /(loss), net of tax	(131.7)				(131.7)
Ending Balance at Jun. 30, 2016	635.9	$ 1.2	1,976.5	(1,036.1)	$ (305.7)	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 20.3		$ 1.0	$ 19.3