Income Taxes- NOL Carryforwards (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	$ 49.5	$ 52.9
Deferred Tax Assets, State Taxes	1.9
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	51.2
U.S. net operating loss carryforwards	1.2	44.3
Deferred Tax Assets, Operating Loss Carryforwards, Foreign	9.6	5.7
Deferred Tax Assets, Operating Loss Carryforwards	60.3	102.9
Operating Loss Carryforwards, Valuation Allowance	18.1	10.8
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards	302.5
Foreign Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Valuation Allowance	8.0	4.2
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Valuation Allowance	10.1	$ 6.6
Tax Credit Carryforward [Member] | Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Taxable Income Required to Realize DTA, Total	1,400.0
Net Operating Loss [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Taxable Income Required to Realize DTA, Total	$ 2,500.0