Sales - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Sales	$ 2,704.6	$ 2,772.1	$ 2,665.9
North America
Disaggregation of Revenue [Line Items]
Sales	1,898.3	1,875.5	1,751.8
Western Europe
Disaggregation of Revenue [Line Items]
Sales	255.7	275.5	288.4
High-growth markets
Disaggregation of Revenue [Line Items]
Sales	432.9	499.4	500.0
Rest of world
Disaggregation of Revenue [Line Items]
Sales	117.7	121.7	125.7
United States
Disaggregation of Revenue [Line Items]
Sales	1,843.2	1,811.8	1,668.6
Sales of products
Disaggregation of Revenue [Line Items]
Sales	2,459.9	2,484.0	2,408.1
Sales of services
Disaggregation of Revenue [Line Items]
Sales	244.7	288.1	257.8
Retail fueling hardware
Disaggregation of Revenue [Line Items]
Sales	822.9	851.2	757.4
Auto repair
Disaggregation of Revenue [Line Items]
Sales	526.9	555.4	562.3
Service and other recurring revenue
Disaggregation of Revenue [Line Items]
Sales	445.3	466.7	433.6
Environmental
Disaggregation of Revenue [Line Items]
Sales	235.7	281.6	281.7
Retail solutions
Disaggregation of Revenue [Line Items]
Sales	375.9	294.9	281.4
Software-as-a-service
Disaggregation of Revenue [Line Items]
Sales	181.6	195.5	215.8
Smart cities
Disaggregation of Revenue [Line Items]
Sales	32.4	38.0	38.1
E-mobility
Disaggregation of Revenue [Line Items]
Sales	24.2	2.1	0.0
Other
Disaggregation of Revenue [Line Items]
Sales	59.7	86.7	95.6
Mobility technologies
Disaggregation of Revenue [Line Items]
Sales	2,087.5	2,134.2	2,026.3
Diagnostics and repair technologies
Disaggregation of Revenue [Line Items]
Sales	$ 617.1	$ 637.9	$ 639.6