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Floating Rate Capital Debt (Tables)
12 Months Ended
Dec. 31, 2020
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, 2020 and 2019.
TABLE 95: SUBORDINATED DEBENTURES
DECEMBER 31,
(In Millions)20202019
NTC Capital I Subordinated Debentures due January 15, 2027$154.3 $154.3 
NTC Capital II Subordinated Debentures due April 15, 2027123.5 123.4 
Total Subordinated Debentures$277.8 $277.7