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Condensed Consolidated Balance Sheets (Parenthetical) - £ / shares | Mar. 31, 2020 | Dec. 31, 2019
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Statement Of Financial Position [Abstract] |  |
Preferred stock, par value | £ 0.05 | £ 0.05
Preferred stock, shares authorized, unlimited | Unlimited | Unlimited
Preferred stock, issued | 289,317,460 | 289,317,460
Preferred stock, shares outstanding | 289,317,460 | 289,317,460
Preferred stock, equivalent ordinary shares upon future consolidation outstanding | 28,931,746 | 28,931,746
Common stock, par value | £ 0.50 | £ 0.50
Common stock, shares authorized, unlimited | Unlimited | Unlimited
Common stock, issued | 367,378,806 | 365,014,893
Common stock, outstanding | 361,707,982 | 360,103,901
Treasury stock, shares | 5,670,824 | 4,910,992

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