Segments - Geographic (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Total net revenues	$ 1,133.1	$ 1,179.8	$ 3,237.3	$ 3,466.5
Total Americas
Segment Reporting Information [Line Items]
Total net revenues	648.8	643.1	1,841.2	1,906.4
United States
Segment Reporting Information [Line Items]
Total net revenues	599.4	597.1	1,677.2	1,754.2
Other
Segment Reporting Information [Line Items]
Total net revenues	49.4	46.0	164.0	152.2
Europe, Middle East, and Africa
Segment Reporting Information [Line Items]
Total net revenues	301.5	329.9	879.6	946.8
Asia Pacific
Segment Reporting Information [Line Items]
Total net revenues	$ 182.8	$ 206.8	$ 516.5	$ 613.3