Industry Segments (Sales) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 29, 2015	Mar. 30, 2014
Revenue from External Customer [Line Items]
Net sales	$ 565.0	$ 573.5
Instrumentation
Revenue from External Customer [Line Items]
Net sales	270.3	258.9
Instrumentation | Marine Instrumentation
Revenue from External Customer [Line Items]
Net sales	159.5	150.6
Instrumentation | Environmental Instrumentation
Revenue from External Customer [Line Items]
Net sales	67.7	61.3
Instrumentation | Test and Measurement Instrumentation
Revenue from External Customer [Line Items]
Net sales	43.1	47.0
Engineered Systems
Revenue from External Customer [Line Items]
Net sales	63.1	59.4
Engineered Systems | Engineered Products and Services
Revenue from External Customer [Line Items]
Net sales	49.1	47.6
Engineered Systems | Turbine Engines
Revenue from External Customer [Line Items]
Net sales	5.6	6.1
Engineered Systems | Energy Systems
Revenue from External Customer [Line Items]
Net sales	$ 8.4	$ 5.7