Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Accounting Policies - Impairment of 50% or Less Owned Companies (Details)

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Basis of Presentation and Accounting Policies - Impairment of 50% or Less Owned Companies (Details)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Other Equity Method Investments  
Schedule Of Equity Method Investments [Line Items]  
Impairment charge for an other-than-temporary decline in fair value $ 0.1