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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]      
Finite-lived intangible assets acquired $ 102,700,000    
Goodwill impairment 0 $ 0 $ 0
Impairment of intangible assets 0 0 0
Amortization expense for other intangible assets $ 34,400,000 $ 18,300,000 $ 50,700,000