Significant Accounting Policies Significant Accounting Policies - Property, Plant and Equipment, Useful Lives (Details)	12 Months Ended
	Dec. 31, 2019
Computers, equipment, and software | Minimum
Property and Equipment [Line Items]
Useful life	1 year 6 months
Computers, equipment, and software | Maximum
Property and Equipment [Line Items]
Useful life	7 years
Furniture and fixtures | Minimum
Property and Equipment [Line Items]
Useful life	5 years
Furniture and fixtures | Maximum
Property and Equipment [Line Items]
Useful life	7 years
Building and building improvements | Minimum
Property and Equipment [Line Items]
Useful life	7 years
Building and building improvements | Maximum
Property and Equipment [Line Items]
Useful life	40 years
Land improvements | Minimum
Property and Equipment [Line Items]
Useful life	10 years
Land improvements | Maximum
Property and Equipment [Line Items]
Useful life	40 years
Leasehold improvements | Maximum
Property and Equipment [Line Items]
Useful life	10 years