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Revenue - Revenues by Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues by Geographic Areas [Line Items]
Total revenues	$ 1,358.0	$ 1,413.3	$ 1,509.0	$ 1,367.0	$ 1,276.9	$ 1,379.1	$ 1,368.4	$ 1,309.3	$ 5,647.3	$ 5,333.7	$ 4,965.1
United States
Revenues by Geographic Areas [Line Items]
Total revenues									4,825.3	4,568.9	4,285.5
Canada and Mexico
Revenues by Geographic Areas [Line Items]
Total revenues									625.0	606.8	530.8
North America
Revenues by Geographic Areas [Line Items]
Total revenues									5,450.3	5,175.7	4,816.3
All other foreign countries
Revenues by Geographic Areas [Line Items]
Total revenues									$ 197.0	$ 158.0	$ 148.8

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