Segment Information Detailed Segment Data (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Sales	$ 1,840.1	$ 1,685.3	$ 5,436.8	$ 4,849.3
Operating Profit	321.4	356.7	1,042.1	1,001.4
Gain from acquisition	0.0	15.3	0.0	15.3
Interest expense	(24.4)	(22.9)	(74.3)	(68.2)
Other non-operating expenses	(0.8)	(0.8)	(2.6)	(2.3)
Earnings before income taxes	296.2	348.3	965.2	946.2
Assets	13,862.8		13,862.8		$ 10,500.6
Operating Segments \| Professional Instrumentation
Segment Reporting Information [Line Items]
Sales	894.1	786.8	2,654.8	2,261.9
Operating Profit	180.0	179.2	605.8	523.2
Assets	8,634.0		8,634.0		5,588.1
Operating Segments \| Industrial Technologies
Segment Reporting Information [Line Items]
Sales	946.0	898.5	2,782.0	2,587.4
Operating Profit	199.7	196.4	558.9	530.9
Assets	3,876.3		3,876.3		3,773.7
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Operating Profit	(58.3)	$ (18.9)	(122.6)	$ (52.7)
Assets	$ 1,352.5		$ 1,352.5		$ 1,138.8

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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