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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2012
Share-Based Compensation [Abstract]  
Summary of Compensation Cost and Other Measures Related to Share-Based Payments
A summary of compensation cost related to share-based payments is as follows (in millions):

Quarter Ended
Six Months Ended
June 30,
June 30,
2012
2011
2012
2011
Share-based expense (net of estimated forfeitures):
Stock options
$
1.1
$
0.3
$
1.4
$
0.6
Restricted stock units
1.0
0.8
2.0
1.8
Total share-based expense
2.1
1.1
3.4
2.4
Total recognized tax benefit
(0.7
)
(0.2
)
(1.1
)
(0.6
)
Share-based expense (net of tax)
$
1.4
$
0.9
$
2.3
$
1.8