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Income Tax Matters (Tables)
 6 Months Ended
Jun. 30, 2016
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,
 
2016
 
2015
 
2016
 
2015
Domestic
$
15.5

 
$
13.4

 
$
30.4

 
$
(162.4
)
Foreign
0.2

 
(1.4
)
 
0.4

 
(1.4
)
Total
$
15.7

 
$
12.0

 
$
30.8

 
$
(163.8
)