Income Taxes (Deferred Tax Assets (Liabilities) Resulting From Temporary Differences) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Tax loss and deduction carryforwards	$ 2,022.1	$ 2,033.0
Tax credit carryforwards	981.0	874.0
All other	471.0	744.0
Valuation allowance	(3,217.7)	(3,296.0)
Total deferred tax assets	256.4	355.0
Deferred tax liabilities:
Unremitted foreign earnings	(22.6)
Total deferred tax liabilities	(74.9)	(215.1)
Net deferred tax assets	$ 181.5	$ 139.9