Segments - Geographic (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Total net revenues	$ 1,308.9	$ 1,221.3	$ 2,529.9	$ 2,319.2
United States
Segment Reporting Information [Line Items]
Total net revenues	749.1	661.3	1,407.2	1,240.3
Other
Segment Reporting Information [Line Items]
Total net revenues	51.7	58.7	105.2	107.9
Total Americas
Segment Reporting Information [Line Items]
Total net revenues	800.8	720.0	1,512.4	1,348.2
Europe, Middle East, and Africa
Segment Reporting Information [Line Items]
Total net revenues	288.2	300.1	572.7	585.5
Asia Pacific
Segment Reporting Information [Line Items]
Total net revenues	$ 219.9	$ 201.2	$ 444.8	$ 385.5