Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
ASSETS:
Cash and cash equivalents	$ 1,192.2		$ 673.4
Accounts receivable, net of allowance of $40.2 and $42.5, respectively	5,209.2		5,126.6
Accounts receivable, billable to clients	1,934.1		1,900.6
Assets held for sale	22.8		5.7
Other current assets	412.4		476.6
Total current assets	8,770.7		8,182.9
Property and equipment, net of accumulated depreciation of $1,116.4 and $1,034.9, respectively	778.1		790.9
Deferred income taxes	252.1		247.0
Goodwill	4,894.4		4,875.9	$ 3,820.4
Other intangible assets	1,014.3		1,094.7
Operating Lease, Right-of-Use Asset	1,574.4	$ 1,421.1	0.0
Other non-current assets	467.9		428.9
TOTAL ASSETS	17,751.9		15,620.3
LIABILITIES:
Accounts payable	7,205.4		6,698.1
Accrued liabilities	742.8		806.9
Contract liabilities	585.6		533.9
Short-term borrowings	52.4		73.7
Current portion of long-term debt	502.0		0.1
Operating Lease, Liability, Current	267.2		0.0
Liabilities held for sale	65.0		11.2
Total current liabilities	9,420.4		8,123.9
Long-term debt	2,771.9		3,660.2
Operating Lease, Liability, Noncurrent	1,429.6		0.0
Deferred compensation	425.0		422.7
Other non-current liabilities	714.7		812.8
TOTAL LIABILITIES	14,761.6		13,019.6
Redeemable noncontrolling interests	164.7		167.9	252.1	$ 252.8
STOCKHOLDERS' EQUITY:
Common stock, $0.10 par value, shares authorized: 800.0 shares issued: 2019 - 387.0; 2018 - 383.6 shares outstanding: 2019 - 387.0; 2018 - 383.6	38.7		38.3
Additional paid-in capital	977.3		895.9
Retained earnings	2,689.9		2,400.1
Accumulated other comprehensive loss, net of tax	(930.0)		(941.1)	(827.8)
Total IPG stockholders' equity	2,775.9		2,393.2
Noncontrolling interests	49.7		39.6
TOTAL STOCKHOLDERS' EQUITY	2,825.6		2,432.8	$ 2,246.3	$ 2,090.4
TOTAL LIABILITIES AND EQUITY	$ 17,751.9		$ 15,620.3