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Net Loss Per Share
 12 Months Ended
Dec. 31, 2025
Earnings Per Share [Abstract]  
Net Loss Per Share Net Loss Per Share
Basic and diluted loss per common share was calculated as follows:
Year ended December 31,
(dollars and shares in millions, except per common share amounts)2025 2024 2023
Net loss$(80.8)$(198.9)$(367.3)
Weighted-average common shares outstanding
 - basic and diluted
70.9 71.9 55.5 
Net loss per common share
 - basic and diluted		$(1.14)$(2.77)$(6.62)
Treasury shares are not considered outstanding and are excluded from the calculation of basic and diluted loss per common share.
The weighted-average number of common shares included in the computation of basic and diluted net loss per common share for the years ended December 31, 2024 and 2023 gave effect to pre-funded warrants which allowed holders to acquire a specified number of common shares at a nominal exercise price of $0.001 per share and were classified as equity. The shares underlying the pre-funded warrants were exercisable for little or no consideration and therefore the underlying shares were considered outstanding at the issuance of the pre-funded warrants for purposes of calculating the weighted-average number of common shares outstanding in basic and diluted net loss per share for common share. As of December 31, 2025, all outstanding pre-funded warrants had been cashless exercised for no consideration. See Note 9, Equity.
The Company reported net losses for each of the years ended December 31, 2025, 2024 and 2023, and therefore excluded all stock options and RSUs from the computation of diluted net loss per common share as their inclusion would have had an anti-dilutive effect, as summarized below:
Year ended December 31,
(shares in millions)202520242023
Stock options8.6 7.9 7.9 
RSUs3.6 2.3 1.2 
12.2 10.2 9.1