Income Taxes Income Taxes - Operating Loss Carryforwards (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Net operating loss and capital loss carryforwards	$ 83.8	$ 74.6
State Operating Loss Carryforwards	824.9
Non-U.S. Tax Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	222.7
Operating Loss Carryforwards subject to expiration	155.1
Operating Loss Carryforwards not subject to expiration	67.6
Operating Loss Carryforwards valuation allowance	143.3
Net operating loss and capital loss carryforwards	222.7
Non-U.S. income tax holidays	28.0	$ 31.0
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards valuation allowance	756.8
Deferred Tax Assets, Tax Credit Carryforwards, Other	19.8
Tax Credit Carryforward, Valuation Allowance	$ 17.9