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Summary of Significant Accounting Principles (Tables)
 12 Months Ended
Dec. 31, 2021
Noncontrolling Interest [Abstract]  
Components of Net Earnings Attributable to Noncontrolling Interests The following table presents the components of net earnings attributable to noncontrolling interests for 2021, 2020 and 2019:

 

 

 

Year Ended December 31,

 

 

 

2021

 

 

2020

 

 

2019

 

 

 

($ in millions)

 

Accretion of redeemable noncontrolling interests

 

$

23.5

 

 

$

2.2

 

 

$

8.8

 

Portion of net earnings attributable to noncontrolling interests

 

 

72.4

 

 

 

22.9

 

 

 

23.6

 

Total

 

$

95.9

 

 

$

25.1

 

 

$

32.4