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Selected Quarterly Financial Data (unaudited)
 12 Months Ended
Dec. 31, 2021
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Data (unaudited) Selected Quarterly Financial Data
The following is a summary of the quarterly results of operations of the Company for the years ended December 31, 2021 and 2020 ($ in millions, unless otherwise noted):
 2021
 First QuarterSecond QuarterThird QuarterFourth Quarter
Revenue$109.7 $133.3 $117.9 $162.9 
Operating income32.5 36.1 28.7 48.5 
Income from continuing operations before income taxes
27.6 34.6 57.4 58.5 
Income from discontinued operations, net of tax21.9 53.4 1.2 0.8 
Gain (Loss) on disposal of discontinued operations, net of tax— 509.2 185.4 (3.6)
Net income40.4 587.3 229.5 39.2 
Net income attributable to controlling interests
27.0 532.7 229.5 39.2 
Basic earnings per share ($)$0.34 $6.71 $2.88 $0.55 
Diluted earnings per share ($)$0.33 $6.42 $2.76 $0.53 
Continuing operations basic earnings per share ($)$0.23 $0.31 $0.54 $0.59 
Continuing operations diluted earnings per share ($)$0.22 $0.29 $0.52 $0.57 
Basic shares outstanding (in millions)79.3 79.4 79.6 70.6 
Diluted shares outstanding (in millions)82.3 82.9 83.2 73.5 
 2020
 First QuarterSecond QuarterThird QuarterFourth Quarter
Revenue$128.6 $122.6 $127.5 $120.8 
Operating income40.7 29.9 34.2 26.9 
Income from continuing operations before income taxes
2.3 36.0 41.2 265.3 
Income from discontinued operations, net of tax23.3 26.7 2.1 15.7 
Net income 22.1 53.9 34.0 205.5 
Net income attributable to controlling interests32.6 18.9 37.2 198.0 
Basic earnings per share ($)$0.38 $0.23 $0.46 $2.49 
Diluted earnings per share ($)$0.38 $0.23 $0.46 $2.42 
Continuing operations basic earnings per share ($)$0.06 $0.26 $0.36 $2.36 
Continuing operations diluted earnings per share ($)$0.09 $0.26 $0.36 $2.30 
Basic shares outstanding (in millions)85.1 80.4 80.0 79.6 
Diluted shares outstanding (in millions)85.1 80.4 80.9 81.8