Description of Business and Summary of Significant Accounting Policies (Property and Equipment Net) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reported Value Measurement [Member] | Continuing Operations [Member]
Property, Plant and Equipment [Line Items]
Assets held for sale	$ 169.1	$ 41.4
Reported Value Measurement [Member] | Discontinued Operations [Member]
Property, Plant and Equipment [Line Items]
Assets held for sale	$ 14.4	$ 15.7
Buildings and improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment estimated useful life	5 years
Buildings and improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment estimated useful life	40 years
Furniture, fixtures, and equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment estimated useful life	3 years
Furniture, fixtures, and equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment estimated useful life	10 years