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Income Tax Matters (Tables)
 9 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]  
Tax Provision
The provision for income taxes for each period presented consisted of the following (in millions of dollars):
 
Quarter Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2017
 
2016
 
2017
 
2016
Domestic
$
15.7

 
$
9.1

 
$
35.8

 
$
39.5

Foreign
0.4

 
0.3

 
1.0

 
0.7

Total
$
16.1

 
$
9.4

 
$
36.8

 
$
40.2