Summary of Significant Accounting Policies - Average Estimated Useful Lives of Property, Plant and Equipment (Details)	12 Months Ended
	Dec. 31, 2019
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Depreciable life	30 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Depreciable life	50 years
Building and leasehold improvements | Minimum
Property, Plant and Equipment [Line Items]
Depreciable life	10 years
Building and leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Depreciable life	20 years
Furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Depreciable life	7 years
Furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Depreciable life	20 years
Automobiles | Minimum
Property, Plant and Equipment [Line Items]
Depreciable life	5 years
Automobiles | Maximum
Property, Plant and Equipment [Line Items]
Depreciable life	7 years
Computer hardware and software | Minimum
Property, Plant and Equipment [Line Items]
Depreciable life	3 years
Computer hardware and software | Maximum
Property, Plant and Equipment [Line Items]
Depreciable life	5 years