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

Earnings per Share (Narrative) (Details)

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Earnings per Share (Narrative) (Details) - shares
shares in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share Awards [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive shares, excluded from computation of diluted net loss per share 4.3 4.0 3.8