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Defined Benefit Pension Plan (Tables)
 6 Months Ended
Dec. 31, 2012
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Schedule of Net Pension Benefit Costs
The components of net pension plan credits for the Company’s defined benefit pension plan, a frozen plan for the benefit of certain current and previous employees in the Company's Michigan market, for the three and six months ended December 31, 2011 and 2012 are as follows (in millions):
 
Three months ended December 31,
 
 
Six months ended December 31,
 
 
2011
 
2012
 
2011
 
2012
Interest cost on projected benefit obligation
$
13.0

 
$
11.7

 
$
26.0

 
$
23.4

Expected return on assets
(14.6
)
 
(15.6
)
 
(28.6
)
 
(31.1
)
Total net pension plan credits
$
(1.6
)
 
$
(3.9
)
 
$
(2.6
)
 
$
(7.7
)