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Quarterly Results of Operations
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Results of Operations
Quarterly Results of Operations (Unaudited)

A summary of the unaudited results of operations for the year ended December 31 is as follows:
 
2018
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Revenues
$
788.2

 
$
765.6

 
$
782.9

 
$
837.7

Gross profit
$
132.1

 
$
126.2

 
$
117.9

 
$
120.9

Operating profit (loss)
$
19.2

 
$
10.8

 
$
12.2

 
$
(3.4
)
Net income (loss)
$
14.9

 
$
5.7

 
$
14.9

 
$
(1.2
)
Net income (loss) attributable to stockholders
$
14.9

 
$
5.6

 
$
15.4

 
$
(1.2
)
 
 
 
 
 
 
 
 
Basic earnings (loss) per share
$
0.90

 
$
0.34

 
$
0.93

 
$
(0.07
)
Diluted earnings (loss) per share
$
0.90

 
$
0.34

 
$
0.93

 
$
(0.07
)
 
2017
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Revenues
$
713.1

 
$
685.5

 
$
691.1

 
$
795.5

Gross profit
$
126.1

 
$
121.7

 
$
121.4

 
$
133.4

Operating profit
$
22.6

 
$
17.5

 
$
18.1

 
$
15.9

Net income (loss)
$
18.1

 
$
16.4

 
$
16.7

 
$
(2.3
)
Net income (loss) attributable to stockholders
$
18.1

 
$
16.4

 
$
16.5

 
$
(2.4
)
 
 
 
 
 
 
 
 
Basic earnings (loss) per share
$
1.10

 
$
1.00

 
$
1.00

 
$
(0.15
)
Diluted earnings (loss) per share
$
1.10

 
$
0.99

 
$
1.00

 
$
(0.15
)


Net income (loss) attributable to stockholders for the fourth quarter of 2017 include the impacts of the Tax Reform Act, which was signed into law December 22, 2017. See Note 7 to the consolidated financial statements for further discussion.