Income Taxes - Federal Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of the difference between the Company's U.S. Federal statutory income tax rate and effective income tax rate for continuing operations
Tax at U.S. federal statutory income tax rate	21.00%	21.00%	35.00%
State income taxes, net of federal benefit	5.50%	8.10%	1.70%
Non-deductible expenses	0.50%	0.30%	0.20%
DTA Deed liability revaluation adjustment	0.00%	1.20%	(12.80%)
Interest expense	0.00%	0.00%	(10.20%)
Adjustment to liabilities for uncertain tax positions	(15.80%)	(32.50%)	(1.20%)
Change in valuation allowance	0.00%	(6.30%)	1.10%
Write-off of state net operating loss carryforwards	0.00%	6.30%	0.00%
Effect of foreign operations	0.30%	2.70%	(4.00%)
Effect of changes in tax law	(0.40%)	(1.40%)	86.40%
Effect of disposal of affiliate	0.00%	2.90%	0.00%
Effect of income from non-controlling interest	1.30%	(0.90%)	1.30%
Impact of increased state tax obligations to deferred tax assets	(1.40%)	0.00%	0.00%
Impact of Redomestication to deferred tax assets	(0.90%)	0.00%	0.00%
Other	(0.40%)	0.50%	(1.40%)
Effective income tax rate for continuing operations	7.10%	3.70%	93.50%
Income tax benefit related to refinement of section 965 toll charge tax liability on mandatory deemed repatriation of foreign earnings	$ 1.0
Tax expense related to GILTI tax	0.5	$ 0.7
Income tax expense related to termination of Deferred Tax Asset Deed		1.6
Income tax benefit due to revaluations of deed as result of Tax Act			$ 18.1
Reductions related to lapses of statutes of limitations	$ 40.8	47.9
Write off of deferred tax asset		8.6
Increase (decrease) in valuation allowance		$ 8.6
State Net Operating Loss Carrforwards
Reconciliation of the difference between the Company's U.S. Federal statutory income tax rate and effective income tax rate for continuing operations
Increase (decrease) in valuation allowance			$ 3.1