Income Taxes Unrecognized Tax Benefits (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Unrecognized tax benefit — Permanent tax positions	$ 7,000,000.0	$ 5,400,000
Unrecognized tax benefit — Temporary tax positions	4,700,000	4,900,000
Total unrecognized tax benefit	11,700,000	10,300,000
NOL and tax credit carryforwards	8,300,000	5,600,000
Net Deferred Tax Liability associated with the Unrecognized Tax Benefit Amounts and Related NOLs and Tax Credit Carryforwards	(4,900,000)	(2,000,000.0)
Decrease in Unrecognized Tax Benefits is Reasonably Possible	8,700,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued	$ 0	$ 0