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Net Loss Per Share
 12 Months Ended
Dec. 31, 2022
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)2022 2021 2020
Net loss$(282.5)$(191.0)$(119.3)
Weighted average common shares outstanding
 - basic and diluted
53.2 50.0 39.5 
Net loss per common share
 - basic and diluted		$(5.31)$(3.82)$(3.02)
The Company reported net losses for each of the years ended December 31 2022, 2021 and 2020, and therefore excluded all stock options, restricted stock awards and restricted stock units 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)202220212020
Stock options6.8 5.3 4.3 
Restricted stock awards— — 0.2 
Restricted stock units0.5 0.1 0.1 
7.3 5.4 4.6