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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial information
 
 
2017
(in millions except per share data)
 
First
 
Second
 
Third
 
Fourth
 
Year
Net sales
 
$
857.3

 
$
1,071.7

 
$
1,089.1

 
$
1,071.8

 
$
4,089.9

Gross margin
 
247.7

 
314.0

 
311.5

 
274.8

 
1,148.0

Operating income
 
96.0

 
159.0

 
146.7

 
104.0

 
505.7

Income from continuing operations
 
61.5

 
102.3

 
86.4

 
115.1

 
365.3

Net income
 
61.8

 
102.3

 
86.3

 
115.1

 
365.5

Basic earnings per share from continuing operations (1)
 
$
0.95

 
$
1.59

 
$
1.38

 
$
1.84

 
$
5.75

Diluted earnings per share from continuing operations (1)
 
$
0.94

 
$
1.58

 
$
1.37

 
$
1.82

 
$
5.71

 
 
2016
(in millions except per share data)
 
First
 
Second
 
Third
 
Fourth
 
Year
Net sales
 
$
794.0

 
$
996.9

 
$
991.0

 
$
893.5

 
$
3,675.4

Gross margin
 
245.4

 
321.2

 
323.6

 
267.1

 
1,157.3

Operating income
 
110.1

 
177.6

 
35.7

 
114.7

 
438.1

Income (loss) from continuing operations
 
68.5

 
115.3

 
(9.5
)
 
76.5

 
250.8

Net income (loss)
 
68.5

 
115.2

 
(9.8
)
 
76.2

 
250.1

Basic earnings (loss) per share from continuing operations (1)
 
$
1.06

 
$
1.78

 
$
(0.15
)
 
$
1.18

 
$
3.87

Diluted earnings (loss) per share from continuing operations (1)
 
$
1.05

 
$
1.75

 
$
(0.15
)
 
$
1.17

 
$
3.83

(1) 
The sum of quarterly earnings per share amounts may not equal the year due to rounding.