Sales - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 25, 2020	Sep. 27, 2019	Sep. 25, 2020	Sep. 27, 2019
Disaggregation of Revenue [Line Items]
Sales	$ 746.7	$ 714.4	$ 1,889.6	$ 2,028.8
Products
Disaggregation of Revenue [Line Items]
Sales	686.0	639.7	1,713.9	1,813.0
Mobility technologies
Disaggregation of Revenue [Line Items]
Sales	578.6	551.6	1,441.6	1,542.8
Diagnostics and repair technologies
Disaggregation of Revenue [Line Items]
Sales	168.1	162.8	448.0	486.0
Services
Disaggregation of Revenue [Line Items]
Sales	60.7	74.7	175.7	215.8
North America
Disaggregation of Revenue [Line Items]
Sales	539.9	494.0	1,348.3	1,369.5
Western Europe
Disaggregation of Revenue [Line Items]
Sales	63.7	65.8	176.6	204.8
High growth markets
Disaggregation of Revenue [Line Items]
Sales	111.7	124.7	279.5	364.6
Rest of world
Disaggregation of Revenue [Line Items]
Sales	31.4	29.9	85.2	89.9
UNITED STATES
Disaggregation of Revenue [Line Items]
Sales	$ 525.5	$ 477.5	$ 1,309.2	$ 1,321.3