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Condensed Consolidated Balance Sheets (Parenthetical) - £ / shares	Sep. 30, 2020	Dec. 31, 2019
Statement Of Financial Position [Abstract]
Preferred stock, par value	£ 0.05	£ 0.05
Preferred stock, shares authorized, unlimited	Unlimited	Unlimited
Preferred stock, issued	23,850,780	289,317,460
Preferred stock, shares outstanding	23,850,780	289,317,460
Preferred stock, equivalent ordinary shares upon future consolidation outstanding	2,385,078	28,931,746
Common stock, par value	£ 0.50	£ 0.50
Common stock, shares authorized, unlimited	Unlimited	Unlimited
Common stock, issued	394,642,079	365,014,893
Common stock, outstanding	388,828,694	360,103,901
Treasury stock, shares	5,813,385	4,910,992

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Face amount or stated value per share of common stock.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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