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Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Other investments	$ 2,057.3	$ 1,865.8
Class A
Common stock, nominal value (in dollars per share)	$ 0.01	$ 0.01
Common stock, issued (in shares)	180,988,130	181,348,114
Common stock, outstanding (in shares)	180,988,130	181,348,114
Class B
Common stock, nominal value (in dollars per share)	$ 0.01	$ 0.01
Common stock, issued (in shares)	12,561,294	12,561,444
Common stock, outstanding (in shares)	12,561,294	12,561,444
Class C
Common stock, nominal value (in dollars per share)	$ 0.01	$ 0.01
Common stock, issued (in shares)	374,982,853	386,588,921
Common stock, outstanding (in shares)	374,982,853	386,588,921

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