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Goodwill, Other Intangibles, and Property and Equipment - Useful Life (Details)
12 Months Ended
Dec. 31, 2018
Building improvements [Member] | Minimum [Member]  
Property Plant And Equipment [Line Items]  
Property, plant and equipment useful life 10 years
Building improvements [Member] | Maximum [Member]  
Property Plant And Equipment [Line Items]  
Property, plant and equipment useful life 40 years
Purchased software [Member] | Minimum [Member]  
Property Plant And Equipment [Line Items]  
Property, plant and equipment useful life 3 years
Purchased software [Member] | Maximum [Member]  
Property Plant And Equipment [Line Items]  
Property, plant and equipment useful life 5 years
Internally developed software [Member] | Minimum [Member]  
Property Plant And Equipment [Line Items]  
Property, plant and equipment useful life 3 years
Internally developed software [Member] | Maximum [Member]  
Property Plant And Equipment [Line Items]  
Property, plant and equipment useful life 7 years
Furniture and equipment (including computer equipment) [Member] | Minimum [Member]  
Property Plant And Equipment [Line Items]  
Property, plant and equipment useful life 3 years
Furniture and equipment (including computer equipment) [Member] | Maximum [Member]  
Property Plant And Equipment [Line Items]  
Property, plant and equipment useful life 10 years