Revenue - Revenues by Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues by Geographic Areas [Line Items]
Total revenues	$ 1,413.3	$ 1,379.1	$ 4,289.3	$ 4,056.8
United States
Revenues by Geographic Areas [Line Items]
Total revenues	1,205.8	1,182.0	3,681.6	3,479.7
Canada and Mexico
Revenues by Geographic Areas [Line Items]
Total revenues	160.5	157.2	462.3	458.4
North America
Revenues by Geographic Areas [Line Items]
Total revenues	1,366.3	1,339.2	4,143.9	3,938.1
All other foreign countries
Revenues by Geographic Areas [Line Items]
Total revenues	$ 47.0	$ 39.9	$ 145.4	$ 118.7