Business Segments (Product Lines) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Instrumentation:
Net Sales	$ 834.2	$ 802.2	$ 782.0	$ 745.2	$ 748.4	$ 725.3	$ 732.5	$ 695.6	$ 3,163.6	$ 2,901.8	$ 2,603.8
Instrumentation
Instrumentation:
Net Sales									1,105.1	1,021.2	953.9
Environmental Instrumentation | Instrumentation
Instrumentation:
Net Sales									391.4	339.6	314.3
Marine Instrumentation | Instrumentation
Instrumentation:
Net Sales									450.2	433.0	430.7
Test and Measurement Instrumentation | Instrumentation
Instrumentation:
Net Sales									$ 263.5	$ 248.6	$ 208.9