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Income Tax Matters (Tables)
 9 Months Ended
Sep. 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
 
Nine Months Ended
 
September 30,
 
September 30,
 
2016
 
2015
 
2016
 
2015
Domestic
$
9.1

 
$
13.4

 
$
39.5

 
$
(149.0
)
Foreign
0.3

 
(0.8
)
 
0.7

 
(2.2
)
Total
$
9.4

 
$
12.6

 
$
40.2

 
$
(151.2
)