Segments - Geographic (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Total net revenues	$ 1,221.0	$ 1,097.9
United States
Segment Reporting Information [Line Items]
Total net revenues	658.1	579.0
Other
Segment Reporting Information [Line Items]
Total net revenues	53.5	49.2
Total Americas
Segment Reporting Information [Line Items]
Total net revenues	711.6	628.2
Europe, Middle East, and Africa
Segment Reporting Information [Line Items]
Total net revenues	284.5	285.4
Asia Pacific
Segment Reporting Information [Line Items]
Total net revenues	$ 224.9	$ 184.3