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Income Tax Matters (Tables)
 6 Months Ended
Jun. 30, 2015
Income Tax Disclosure [Abstract]  
Tax Provision
The provision for (benefit from) incomes taxes, for each period presented, consisted of the following (in millions of dollars):
 
Quarter Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2015
 
2014
 
2015
 
2014
Domestic
$
13.4

 
$
13.9

 
$
(162.4
)
 
$
23.0

Foreign
(1.4
)
 
0.6

 
(1.4
)
 
0.9

Total
$
12.0

 
$
14.5

 
$
(163.8
)
 
$
23.9