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Redeemable Noncontrolling Interests (Tables)
6 Months Ended
Jun. 30, 2021
Redeemable Noncontrolling Interest [Abstract]  
Redeemable Noncontrolling Interest [Table Text Block]
Changes in redeemable noncontrolling interests were as follows:
20212020
Beginning balance as of January 1$19.2 $20.9 
Redemption value adjustment— (0.8)
Termination of put option(19.2)— 
Ending balance as of June 30$— $20.1