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NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS
 6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS
NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS

The following notes payable were direct corporate obligations of the Company as of June 30, 2021 and December 31, 2020 (dollars in millions):
June 30,
2021		December 31,
2020
5.250% Senior Notes due May 2025
$500.0 $500.0 
5.250% Senior Notes due May 2029
500.0 500.0 
5.125% Subordinated Debentures due November 2060
150.0 150.0 
Revolving Credit Agreement (as defined below)— — 
Unamortized debt issue costs(13.1)(13.8)
Direct corporate obligations$1,136.9 $1,136.2 

Revolving Credit Agreement
On July 16, 2021, the Company amended and restated its $250.0 million revolving credit agreement (as so amended and restated, the "Revolving Credit Agreement"). The Revolving Credit Agreement, among other things, (i) requires the Company to maintain (each as calculated in accordance with the Revolving Credit Agreement): (i) a debt to total capitalization ratio (excluding hybrid securities, except to the extent that the aggregate amount outstanding of all such hybrid securities exceeds an amount equal to 15% of total capitalization) of not more than 35.0 percent (such ratio was 22.4 percent at June 30, 2021); and (ii) a minimum consolidated net worth of not less than the sum of (x) $2,674 million plus (y) 25.0 percent of the net equity proceeds received by the Company from the issuance and sale of equity interests in the Company (the Company's consolidated net worth was $3,328.5 million at June 30, 2021 compared to the minimum requirement of $2,691.2 million). The maturity date of the Revolving Credit Agreement is July 16, 2026. The Revolving Credit Agreement contains certain other restrictive covenants with which the Company must comply. The interest rate applicable to loans under the Revolving Credit Agreement is calculated as the eurodollar rate or the base rate, at the Company’s option, plus a margin based on the Company’s unsecured debt rating. The margins under the Revolving Credit Agreement range from 1.375 percent to 2.125 percent, in the case of loans at the eurodollar rate, and 0.375 percent to 1.125 percent, in the case of loans at the base rate. The commitment fee under the Revolving Credit Agreement is based on the Company's unsecured debt rating and the Revolving Credit Agreement includes updated LIBOR fallback provisions. There were no amounts outstanding under the Revolving Credit Agreement during the six months ended June 30, 2021.