Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ (3.4)	$ (5.5)
Unrecognized tax benefit that, if recognized, would favorably affect our effective income tax rate			$ 41.8
Accrued interest related to uncertain tax positions			$ 9.2	$ 8.9