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Business Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Net revenues	$ 1,293.7	$ 1,134.7	$ 2,496.2	$ 2,221.0
Percent change in net sales	14.00%		12.40%
Gross profit	$ 815.9	705.7	$ 1,566.4	1,373.3
Percent change in gross profit	15.60%		14.10%
Operating profit	$ 399.2	332.0	$ 741.1	624.6
Percent change in operating profit	20.20%		18.70%
Long-lived assets	$ 179.7	167.7	$ 179.7	167.7
Percent change in long-lived assets	7.20%
Operating Segments | RF Technology
Segment Reporting Information [Line Items]
Net revenues	$ 537.4	460.5	$ 1,019.0	890.1
Percent change in net sales	16.70%		14.50%
Gross profit	$ 344.4	279.7	$ 646.1	531.2
Percent change in gross profit	23.10%		21.60%
Operating profit	$ 157.6	119.5	$ 277.9	208.5
Percent change in operating profit	31.90%		33.30%
Long-lived assets	$ 97.4	80.1	$ 97.4	80.1
Percent change in long-lived assets	21.60%
Operating Segments | Medical & Scientific Imaging
Segment Reporting Information [Line Items]
Net revenues	$ 373.7	350.8	$ 740.0	699.0
Percent change in net sales	6.50%		5.90%
Gross profit	$ 265.6	254.1	$ 526.6	506.0
Percent change in gross profit	4.50%		4.10%
Operating profit	$ 125.6	121.3	$ 246.3	241.1
Percent change in operating profit	3.50%		2.20%
Long-lived assets	$ 41.7	45.2	$ 41.7	45.2
Percent change in long-lived assets	(7.70%)
Operating Segments | Industrial Technology
Segment Reporting Information [Line Items]
Net revenues	$ 231.6	192.9	$ 447.7	376.3
Percent change in net sales	20.10%		19.00%
Gross profit	$ 118.8	98.2	$ 227.4	191.3
Percent change in gross profit	21.00%		18.90%
Operating profit	$ 74.1	58.3	$ 139.8	111.9
Percent change in operating profit	27.10%		24.90%
Long-lived assets	$ 30.7	33.0	$ 30.7	33.0
Percent change in long-lived assets	(7.00%)
Operating Segments | Energy Systems & Controls
Segment Reporting Information [Line Items]
Net revenues	$ 151.0	130.5	$ 289.5	255.6
Percent change in net sales	15.70%		13.30%
Gross profit	$ 87.1	73.7	$ 166.3	144.8
Percent change in gross profit	18.20%		14.80%
Operating profit	$ 41.9	32.9	$ 77.1	63.1
Percent change in operating profit	27.40%		22.20%
Long-lived assets	$ 9.9	9.4	$ 9.9	9.4
Percent change in long-lived assets	5.30%
Corporate
Segment Reporting Information [Line Items]
Unallocated corporate general and administrative expenses	$ 44.9	$ 37.8	$ 86.6	$ 72.1

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