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Summary of Significant Accounting Principles (Tables)
 3 Months Ended
Mar. 31, 2022
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 the three months ended March 31, 2022 and 2021:

 

 

 

Three Months Ended
March 31,

 

 

 

2022

 

 

2021

 

 

 

($ in millions)

 

Accretion of redeemable noncontrolling interests

 

$

18.8

 

 

$

0.6

 

Portion of net earnings attributable to noncontrolling interests

 

 

24.4

 

 

 

7.5

 

Total

 

$

43.2

 

 

$

8.1