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Goodwill and Intangible Assets (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]      
Goodwill impairment charges $ 0 $ 0 $ 0
Subsidiaries | Five Reporting Units      
Goodwill [Line Items]      
Goodwill   530,600,000  
Indefinite-lived Intangible Assets (Excluding Goodwill)   $ 963,000  
Goodwill impairment test fair value exceeding adjusted net book value 63.00%