Income Taxes (Components of Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Mar. 31, 2013	Mar. 31, 2013	Mar. 31, 2012
Provision for income taxes from continuing operations [Abstract]
Current federal		$ 11.5	$ 2.2
Current state		0.2	2.8
Total current		11.7	5.0
Deferred federal		13.9	13.4
Deferred state		0.4	0.7
Total deferred		14.3	14.1
Change in valuation allowance	1.6	(1.5)	1.3
Total income tax expense (benefit)		$ 24.5	$ 20.4