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Floating Rate Capital Debt (Tables)
12 Months Ended
Dec. 31, 2021
Brokers and Dealers [Abstract]  
Summary of Book Values of Outstanding Subordinated Debentures
The following table summarizes the book values of the outstanding subordinated debentures as of December 31, 2021 and 2020.

TABLE 91: SUBORDINATED DEBENTURES
DECEMBER 31,
(In Millions)20212020
NTC Capital I Subordinated Debentures$— $154.3 
NTC Capital II Subordinated Debentures— 123.5 
Total Subordinated Debentures$— $277.8