Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Other Intangible Assets (Narrative) (Details)

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Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Intangible Assets [Abstract]      
Impairment charges   $ 2.2 $ 2.2
Amortization of intangible assets $ 25.2 $ 32.4 $ 35.0