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Revenue Major Geographical Area (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
Net revenue	$ 2,284.4	$ 1,954.6	$ 1,853.4	$ 1,972.1	$ 2,433.0	$ 2,061.4	$ 2,125.9	$ 2,004.8	$ 8,064.5	$ 8,625.1	$ 8,031.6
Total revenue	$ 2,550.0	$ 2,125.5	$ 2,025.7	$ 2,359.8	$ 2,901.8	$ 2,438.1	$ 2,520.2	$ 2,361.2	9,061.0	10,221.3	9,714.4
United States
Net revenue									5,211.4	5,386.1	4,825.0
Total revenue									5,751.5	6,368.7	5,851.0
Total International
Net revenue									2,853.1	3,239.0	3,206.6
Total revenue									3,309.5	3,852.6	3,863.4
United Kingdom
Net revenue									664.3	727.0	711.7
Total revenue									742.9	871.8	881.4
Continental Europe
Net revenue									683.6	742.4	737.5
Total revenue									763.5	842.9	840.2
Asia Pacific
Net revenue									710.5	858.3	896.8
Total revenue									879.5	1,102.3	1,170.8
Latin America
Net revenue									323.4	389.9	350.1
Total revenue									349.7	431.6	389.0
Other
Net revenue									471.3	521.4	510.5
Total revenue									573.9	604.0	582.0
IAN
Net revenue									6,921.4	7,328.8	6,720.9
Total revenue									7,410.1	7,992.0	7,427.3
IAN | United States
Net revenue									4,451.7	4,538.1	3,953.8
Total revenue									4,658.5	4,878.1	4,318.2
IAN | Total International
Net revenue									2,469.7	2,790.7	2,767.1
Total revenue									2,751.6	3,113.9	3,109.1
DXTRA
Net revenue									1,143.1	1,296.3	1,310.7
Total revenue									1,650.9	2,229.3	2,287.1
DXTRA | United States
Net revenue									759.7	848.0	871.2
Total revenue									1,093.0	1,490.6	1,532.8
DXTRA | Total International
Net revenue									383.4	448.3	439.5
Total revenue									$ 557.9	$ 738.7	$ 754.3

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