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Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information
Quarterly Financial Data (Unaudited)
 
Quarter Ended
2016
December 31,
2016(1)
 
September 29,
2016(2)
 
June 30,
2016(3)
 
March 31,
2016(4)
Revenues
$
1,570.0

 
$
1,711.4

 
$
1,829.9

 
$
1,681.6

Gross profit
$
236.8

 
$
272.0

 
$
157.9

 
$
322.6

Operating income
$
160.9

 
$
214.4

 
$
83.3

 
$
266.5

Net income
$
108.2

 
$
145.1

 
$
44.8

 
$
171.6

Earnings per share, basic
$
0.90

 
$
1.16

 
$
0.35

 
$
1.30

Earnings per share, diluted
$
0.89

 
$
1.16

 
$
0.35

 
$
1.29

 
 
Quarter Ended
2015
December 31,
2015(5)
 
October 1,
2015(6)
 
July 2,
2015(7)
 
April 2,
2015(8)
Revenues
$
1,609.4

 
$
1,593.6

 
$
1,698.7

 
$
1,742.2

Gross profit
$
274.3

 
$
252.6

 
$
290.8

 
$
293.9

Operating income
$
205.8

 
$
191.6

 
$
230.3

 
$
235.3

Net income
$
138.3

 
$
313.6

 
$
154.9

 
$
181.9

Earnings per share, basic
$
1.02

 
$
2.25

 
$
1.11

 
$
1.31

Earnings per share, diluted
$
1.01

 
$
2.24

 
$
1.11

 
$
1.30

______________________________________

(1)
Fourth quarter 2016 earnings include the impact of net favorable changes in estimate    of $7.5, as well as $11.8 related to early retirement incentives.
(2)
Third quarter 2016 earnings includes the impact of net unfavorable changes in estimate of $5.5.
(3)
Second quarter 2016 earnings include the impact of net unfavorable changes in estimate of $134.7.
(4)
First quarter 2016 earnings includes the impact of net favorable changes in estimate of $47.2, as well as $11.8 related to early retirement incentives.
(5)
Fourth quarter 2015 earnings include the impact of net favorable changes in estimate    of $14.2.
(6)
Third quarter 2015 earnings includes the impact of net favorable changes in estimate of $19.0, as well as valuation allowance release of $189.4.
(7)
Second quarter 2015 earnings include the impact of net favorable changes in estimate of $18.8    .
(8)
First quarter 2015 earnings includes the impact of net favorable changes in estimate $14.9, as well as valuation allowance release $42.0.