Segment Information Major Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues and Long-Lived Assets
Long-Lived Assets	$ 1,219.7				$ 1,034.1				$ 1,219.7	$ 1,034.1
Net revenue	2,413.7	$ 1,895.7	$ 1,948.2	$ 1,774.0	2,131.1	$ 1,832.5	$ 1,834.6	$ 1,675.3	8,031.6	7,473.5	$ 7,452.3
Domestic
Revenues and Long-Lived Assets
Long-Lived Assets	892.9				694.5				892.9	694.5
Total International
Revenues and Long-Lived Assets
Long-Lived Assets	326.8				339.6				326.8	339.6
Net revenue									3,206.6	3,014.7	3,009.1
United Kingdom
Revenues and Long-Lived Assets
Long-Lived Assets	57.9				56.2				57.9	56.2
Net revenue									711.7	613.1	604.3
Continental Europe
Revenues and Long-Lived Assets
Long-Lived Assets	57.9				73.6				57.9	73.6
Net revenue									737.5	687.8	682.0
Asia Pacific
Revenues and Long-Lived Assets
Long-Lived Assets	121.7				115.5				121.7	115.5
Net revenue									896.8	866.9	887.7
Latin America
Revenues and Long-Lived Assets
Long-Lived Assets	43.6				48.2				43.6	48.2
Net revenue									350.1	350.8	367.8
Other
Revenues and Long-Lived Assets
Long-Lived Assets	$ 45.7				$ 46.1				45.7	46.1
Net revenue									$ 510.5	$ 496.1	$ 467.3