Income Taxes (Operating Loss and Tax Credit Carryforwards) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
U.S. Federal net operating loss carryforwards	$ 659.2	$ 589.9
United States [Member]
U.S. Federal net operating loss carryforwards	766.2
U.S. credit carryforwards	140.6
Deferred Tax Assets, Capital Loss Carryforwards	36.3
State and Local Jurisdiction [Member]
U.S. credit carryforwards	35.2
U.S. State net operating loss carryforwards	3,119.7
Non-U.S. [Member]
Non-U.S. net operating loss carryforwards	865.8
Non-U.S. credit carryforwards	$ 7.7

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards.

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