Segment Information Detailed Segment Data (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Sales	$ 1,856.0	$ 1,628.8	$ 3,596.7	$ 3,164.0
Operating Profit	382.4	349.1	720.6	644.7
Earnings before income taxes	356.0	325.6	668.9	597.9
Interest Expense	25.3	22.7	49.9	45.3
Other Nonoperating Expense	1.1	0.8	1.8	1.5
Operating Segments \| Professional Instrumentation
Segment Reporting Information [Line Items]
Sales	889.0	759.0	1,760.7	1,475.1
Operating Profit	219.4	185.5	425.8	344.0
Operating Segments \| Industrial Technologies
Segment Reporting Information [Line Items]
Sales	967.0	869.8	1,836.0	1,688.9
Operating Profit	200.9	181.7	359.2	334.5
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating Profit	$ (37.9)	$ (18.1)	$ (64.4)	$ (33.8)

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