Financing Arrangements (Redemption of 10.375% Senior Discount Notes) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			0 Months Ended		3 Months Ended	9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Jun. 30, 2012	Mar. 19, 2013 10.375% Senior Discount Notes	Jan. 26, 2011 10.375% Senior Discount Notes	Mar. 31, 2012 10.375% Senior Discount Notes	Mar. 31, 2013 10.375% Senior Discount Notes	Jun. 30, 2012 10.375% Senior Discount Notes
Debt Instrument [Line Items]
Face amount of notes issued							$ 747.2
Cash proceeds from issuance of notes			300.0	452.2			444.7
Extinguishment of Debt Disclosures [Abstract]
Accreted value of notes redeemed						10.7		453.6		6.0
Payments of tender premiums on note redemption			(0.5)	(27.6)		0.5		(27.6)
Long-term debt	2,995.3		2,995.3		2,706.6			14.7	0	9.9
Debt extinguishment costs	1.3	0	1.3	38.9				38.9	1.3
Debt extinguishment costs, net of taxes								25.3	0.9
Amount of notes redeemed						$ 14.3		$ 724.0		$ 8.9