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Disclosures about Fair Value of Financial Instruments (Tables)
 9 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Summary of Company's Financial Instruments Whose Carrying Amount Did Not Equal Fair Value
A summary of our financial instruments whose carrying value did not equal fair value is shown below:
September 30, 2021December 31, 2020
(in millions)Carrying
Amount		Fair
Value		Carrying
Amount		Fair
Value
Junior subordinated debentures:
Trust preferred debentures$172.7 $173.1 $172.7 $173.6 
Subordinated debentures85.4 92.0 85.1 92.3 
Total junior subordinated debentures258.1 265.1 257.8 265.9 
Senior unsecured fixed rate notes140.3 150.1 140.2 146.7 
Floating rate loan stock58.7 58.9 60.7 61.0 
457.1 474.1 458.7 473.6 
Fair Value, Assets Measured on Recurring and Nonrecurring Basis
Based on an analysis of the inputs, our financial instruments measured at fair value for disclosure purposes have been categorized as follows:
Fair Value Measurements at Reporting Date Using
(in millions)September 30, 2021Level 1 (a)Level 2 (b)Level 3 (c)
Junior subordinated debentures:
Trust preferred debentures$173.1 $— $173.1 $— 
Subordinated debentures92.0 — 92.0 — 
Total junior subordinated debentures265.1 — 265.1 — 
Senior unsecured fixed rate notes150.1 150.1 — — 
Floating rate loan stock58.9 — 58.9 — 
474.1 150.1 324.0 — 
(a)Quoted prices in active markets for identical assets
(b)Significant other observable inputs
(c)Significant unobservable inputs
Fair Value Measurements at Reporting Date Using
(in millions)December 31, 2020Level 1 (a)Level 2 (b)Level 3 (c)
Junior subordinated debentures:
Trust preferred debentures$173.6 $— $173.6 $— 
Subordinated debentures92.3 — 92.3 — 
Total junior subordinated debentures265.9 — 265.9 — 
Senior unsecured fixed rate notes146.7 146.7 — — 
Floating rate loan stock61.0 — 61.0 — 
473.6 146.7 326.9 — 
(a)Quoted prices in active markets for identical assets
(b)Significant other observable inputs
(c)Significant unobservable inputs