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Debt and Credit Arrangements (Tables)
12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Long-Term Debt

Debt consists of the following:

 

DECEMBER 31

 

2018

 

 

2017

 

(in millions)

 

 

 

 

 

 

 

 

Senior debentures maturing April 15, 2026

 

$

375.0

 

 

$

375.0

 

Senior debentures maturing October 15, 2025

 

 

62.6

 

 

 

62.6

 

Subordinated debentures maturing March 30, 2053

 

 

175.0

 

 

 

175.0

 

Subordinated debentures maturing February 3, 2027

 

 

50.1

 

 

 

59.7

 

FHLB borrowings (secured)

 

 

125.0

 

 

 

125.0

 

Total principal debt

 

 

787.7

 

 

 

797.3

 

Unamortized debt issuance costs

 

 

(9.8

)

 

 

(10.4

)

Total

 

$

777.9

 

 

$

786.9