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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The components of accumulated other comprehensive loss, net of taxes, as of June 30, 2012 and December 31, 2012 are as follows (in millions).
 
June 30, 2012
 
December 31, 2012
Unrealized holding gain on investments in securities
$
0.7

 
$
4.0

Defined benefit pension plan
(80.6
)
 
(80.6
)
Post-employment defined benefit plan
0.9

 
0.9

Income tax benefit
30.6

 
29.2

Accumulated other comprehensive loss
$
(48.4
)
 
$
(46.5
)