Income Taxes - Reconciliation Between U.S. Federal Income Tax Rate and Our Effective Tax Rate From Continuing Operations (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal income tax rate	21.00%	21.00%	35.00%
State income taxes, net of federal benefit	2.30%	4.10%	3.70%
Change in International valuation allowance	1.30%	0.90%	0.40%
Gain on APAC JV ownership changes	0.00%	0.00%	(0.20%)
Political advocacy costs	0.20%	2.30%	0.00%
APAC investment impairment	0.00%	0.00%	6.40%
Impact of 2017 Tax Act	0.00%	(0.10%)	(20.50%)
Unrecognized tax benefits	2.40%	0.20%	0.10%
Other	1.10%	0.80%	1.50%
Impact of noncontrolling interests primarily attributable to non-tax paying entities	(4.90%)	(4.60%)	(3.30%)
Effective tax rate	23.40%	24.60%	23.10%