Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Restructuring Charges Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 112.6	$ 2.1	$ 112.6	$ 33.9
Lease impairment costs	$ 65.7	$ 0.0	65.7	$ 11.9
IAN [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			68.8
Lease impairment costs			35.8
CMG [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			36.7
Lease impairment costs			$ 26.8