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Defined Benefit Pension Plan (Tables)
 9 Months Ended
Mar. 31, 2013
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 nine months ended March 31, 2012 and 2013 are as follows (in millions).
 
Three months ended March 31,
 
Nine months ended March 31,
 
2012
 
2013
 
2012
 
2013
Interest cost on projected benefit obligation
$
13.0

 
$
11.8

 
$
39.0

 
$
35.2

Expected return on plan assets
(14.3
)
 
(15.7
)
 
(42.9
)
 
(46.8
)
Total net pension plan credits
$
(1.3
)
 
$
(3.9
)
 
$
(3.9
)
 
$
(11.6
)