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16. Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Data [Abstract]  
Schedule of Quarterly Financial Data [Table Text Block]
As reported:
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
2017
 
 
 
 
 
 
 
 
Net sales
 
$
500.1

 
$
504.7

 
$
535.0

 
$
620.4

Cost of goods sold
 
230.1

 
231.4

 
230.5

 
280.8

Gross profit
 
270.0

 
273.3

 
304.5

 
339.6

Selling, general and administrative expense
 
194.9

 
213.0

 
196.8

 
204.2

Research and development expense
 
49.5

 
62.6

 
61.4

 
76.8

Income before income taxes
 
20.1

 
1.1

 
38.9

 
37.7

(Provision for) benefit from income taxes
 
(7.7
)
 
3.9

 
(11.5
)
 
32.2

Net income
 
12.4

 
5.0

 
27.4

 
69.9

Basic earnings per share
 
$
0.42

 
$
0.17

 
$
0.92

 
$
2.35

Diluted earnings per share
 
$
0.41

 
$
0.17

 
$
0.91

 
$
2.32

 
 
 
 
 
 
 
 
 
2016
 
 
 
 
 
 
 
 
Net sales
 
$
471.2

 
$
516.8

 
$
508.7

 
$
571.5

Cost of goods sold
 
207.2

 
236.6

 
229.2

 
257.1

Gross profit
 
264.0

 
280.2

 
279.5

 
314.4

Selling, general and administrative expense
 
189.7

 
205.5

 
201.5

 
220.0

Research and development expense
 
48.6

 
49.8

 
49.9

 
57.6

Income (loss) before income taxes
 
20.2

 
26.9

 
22.7

 
(28.2
)
(Provision for) benefit from income taxes
 
(7.9
)
 
(8.9
)
 
(4.3
)
 
7.6

Net income (loss)
 
12.3

 
18.0

 
18.4

 
(20.6
)
Basic earnings (loss) per share
 
$
0.42

 
$
0.61

 
$
0.63

 
$
(0.70
)
Diluted earnings (loss) per share
 
$
0.42

 
$
0.61

 
$
0.62

 
$
(0.70
)


Adjustments:
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
2017
 
 
 
 
 
 
 
 
Net sales
 
$
—

 
$
—

 
$
(0.9
)
 
$
0.9

Cost of goods sold
 
—

 
—

 
4.7

 
(4.7
)
Gross profit
 
—

 
—

 
(5.6
)
 
5.6

Selling, general and administrative expense
 
—

 
—

 
1.9

 
(1.9
)
Research and development expense
 
—

 
—

 
0.7

 
(0.7
)
Income before income taxes
 
—

 
—

 
(8.2
)
 
8.2

(Provision for) benefit from income taxes
 
—

 
—

 
2.9

 
4.6

Net income
 
—

 
—

 
(5.3
)
 
12.8

Basic earnings per share
 
$
—

 
$
—

 
$
(0.18
)
 
$
0.43

Diluted earnings per share
 
$
—

 
$
—

 
$
(0.18
)
 
$
0.43

 
 
 
 
 
 
 
 
 
2016
 
 
 
 
 
 
 
 
Net sales
 
$
—

 
$
—

 
$
—

 
$
—

Cost of goods sold
 
—

 
—

 
—

 
—

Gross profit
 
—

 
—

 
—

 
—

Selling, general and administrative expense
 
—

 
—

 
—

 
—

Research and development expense
 
—

 
—

 
—

 
—

Income (loss) before income taxes
 
—

 
—

 
—

 
—

(Provision for) benefit from income taxes
 
(1.3
)
 
(1.4
)
 
(1.3
)
 
1.9

Net income (loss)
 
(1.3
)
 
(1.4
)
 
(1.3
)
 
1.9

Basic earnings (loss) per share
 
$
(0.04
)
 
$
(0.05
)
 
$
(0.05
)
 
$
0.07

Diluted earnings (loss) per share
 
$
(0.05
)
 
$
(0.05
)
 
$
(0.04
)
 
$
0.07


As revised:
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
2017
 
 
 
 
 
 
 
 
Net sales
 
$
500.1

 
$
504.7

 
$
534.1

 
$
621.3

Cost of goods sold
 
230.1

 
231.4

 
235.2

 
276.1

Gross profit
 
270.0

 
273.3

 
298.9

 
345.2

Selling, general and administrative expense
 
194.9

 
213.0

 
198.7

 
202.3

Research and development expense
 
49.5

 
62.6

 
62.1

 
76.1

Income before income taxes
 
20.1

 
1.1

 
30.7

 
45.9

(Provision for) benefit from income taxes
 
(7.7
)
 
3.9

 
(8.6
)
 
36.8

Net income
 
12.4

 
5.0

 
22.1

 
82.7

Basic earnings per share
 
$
0.42

 
$
0.17

 
$
0.74

 
$
2.78

Diluted earnings per share
 
$
0.41

 
$
0.17

 
$
0.73

 
$
2.75

 
 
 
 
 
 
 
 
 
2016
 
 
 
 
 
 
 
 
Net sales
 
$
471.2

 
$
516.8

 
$
508.7

 
$
571.5

Cost of goods sold
 
207.2

 
236.6

 
229.2

 
257.1

Gross profit
 
264.0

 
280.2

 
279.5

 
314.4

Selling, general and administrative expense
 
189.7

 
205.5

 
201.5

 
220.0

Research and development expense
 
48.6

 
49.8

 
49.9

 
57.6

Income (loss) before income taxes
 
20.2

 
26.9

 
22.7

 
(28.2
)
(Provision for) benefit from income taxes
 
(9.2
)
 
(10.3
)
 
(5.6
)
 
9.5

Net income (loss)
 
11.0

 
16.6

 
17.1

 
(18.7
)
Basic earnings (loss) per share
 
$
0.38

 
$
0.56

 
$
0.58

 
$
(0.63
)
Diluted earnings (loss) per share
 
$
0.37

 
$
0.56

 
$
0.58

 
$
(0.63
)