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Fair Value (Tables)
9 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Composition of Investment Portfolio by Major Security Type
The composition of the investment portfolio by major security type and our outstanding debt was:
 Fair Value 
(millions)Level 1Level 2Level 3TotalCost
September 30, 2020
Fixed maturities:
U.S. government obligations$10,203.8 $$$10,203.8 $9,835.1 
State and local government obligations4,529.8 4,529.8 4,382.1 
Corporate debt securities10,612.0 10,612.0 10,038.7 
Subtotal10,203.8 15,141.8 25,345.6 24,255.9 
Asset-backed securities:
Residential mortgage-backed531.0 531.0 525.4 
Commercial mortgage-backed6,053.6 6,053.6 5,964.4 
Other asset-backed4,200.3 4,200.3 4,155.8 
Subtotal asset-backed securities10,784.9 10,784.9 10,645.6 
Redeemable preferred stocks:
Financials49.2 49.2 51.2 
Utilities11.3 11.3 10.0 
Industrials10.1 112.4 122.5 120.1 
Subtotal redeemable preferred stocks10.1 172.9 183.0 181.3 
Total fixed maturities10,213.9 26,099.6 36,313.5 35,082.8 
Short-term investments4,506.2 161.6 4,667.8 4,667.8 
    Total available-for-sale securities14,720.1 26,261.2 40,981.3 39,750.6 
Equity securities:
Nonredeemable preferred stocks:
Financials112.6 1,096.1 38.1 1,246.8 1,222.7 
Utilities40.7 40.7 39.9 
Industrials20.5 15.2 35.7 40.1 
Subtotal nonredeemable preferred stocks112.6 1,157.3 53.3 1,323.2 1,302.7 
Common equities:
Common stocks3,457.1 3,457.1 1,127.3 
Other risk investments2.7 2.7 2.7 
Subtotal common equities3,457.1 2.7 3,459.8 1,130.0 
    Total equity securities3,569.7 1,157.3 56.0 4,783.0 2,432.7 
Total portfolio$18,289.8 $27,418.5 $56.0 $45,764.3 $42,183.3 
Debt$$6,687.4 $$6,687.4 $5,395.4 
 Fair Value 
(millions)Level 1Level 2Level 3TotalCost
September 30, 2019
Fixed maturities:
U.S. government obligations$13,678.7 $$$13,678.7 $13,387.6 
State and local government obligations1,683.7 1,683.7 1,652.2 
Corporate debt securities7,281.1 7,281.1 7,048.9 
Subtotal13,678.7 8,964.8 22,643.5 22,088.7 
Asset-backed securities:
Residential mortgage-backed681.5 681.5 677.5 
Commercial mortgage-backed4,639.0 4,639.0 4,547.9 
Other asset-backed4,621.9 4,621.9 4,601.0 
Subtotal asset-backed securities9,942.4 9,942.4 9,826.4 
Redeemable preferred stocks:
Financials51.7 51.7 51.7 
Utilities10.9 10.9 10.0 
Industrials11.2 153.0 164.2 158.1 
Subtotal redeemable preferred stocks11.2 215.6 226.8 219.8 
Total fixed maturities13,689.9 19,122.8 32,812.7 32,134.9 
Short-term investments1,464.9 2.5 1,467.4 1,467.4 
    Total available-for-sale securities15,154.8 19,125.3 34,280.1 33,602.3 
Equity securities:
Nonredeemable preferred stocks:
Financials82.2 967.1 27.1 1,076.4 1,004.3 
Utilities42.1 42.1 39.9 
Industrials5.0 5.0 10.0 10.0 
Subtotal nonredeemable preferred stocks82.2 1,014.2 32.1 1,128.5 1,054.2 
Common equities:
Common stocks3,164.8 3,164.8 1,210.0 
Other risk investments0.3 0.3 0.3 
Subtotal common equities3,164.8 0.3 3,165.1 1,210.3 
    Total equity securities3,247.0 1,014.2 32.4 4,293.6 2,264.5 
Total portfolio$18,401.8 $20,139.5 $32.4 $38,573.7 $35,866.8 
Debt$$5,113.3 $$5,113.3 $4,406.5 
 Fair Value 
(millions)Level 1Level 2Level 3TotalCost
December 31, 2019
Fixed maturities:
U.S. government obligations$13,251.1 $$$13,251.1 $13,100.7 
State and local government obligations1,713.3 1,713.3 1,686.0 
Corporate debt securities7,067.7 7,067.7 6,860.3 
Subtotal13,251.1 8,781.0 22,032.1 21,647.0 
Asset-backed securities:
Residential mortgage-backed627.5 627.5 625.0 
Commercial mortgage-backed5,076.2 5,076.2 5,020.7 
Other asset-backed5,179.5 5,179.5 5,164.7 
Subtotal asset-backed securities10,883.2 10,883.2 10,810.4 
Redeemable preferred stocks:
Financials51.7 51.7 51.5 
Utilities11.1 11.1 10.0 
Industrials11.1 121.1 132.2 124.2 
Subtotal redeemable preferred stocks11.1 183.9 195.0 185.7 
Total fixed maturities13,262.2 19,848.1 33,110.3 32,643.1 
Short-term investments1,797.4 1.4 1,798.8 1,798.8 
    Total available-for-sale securities15,059.6 19,849.5 34,909.1 34,441.9 
Equity securities:
Nonredeemable preferred stocks:
Financials77.4 850.7 27.1 955.2 891.3 
Utilities42.3 42.3 39.9 
Industrials25.4 16.0 41.4 40.1 
Subtotal nonredeemable preferred stocks77.4 918.4 43.1 1,038.9 971.3 
Common equities:
Common stocks3,306.0 3,306.0 1,125.2 
Other risk investments0.3 0.3 0.3 
Subtotal common equities3,306.0 0.3 3,306.3 1,125.5 
    Total equity securities3,383.4 918.4 43.4 4,345.2 2,096.8 
Total portfolio$18,443.0 $20,767.9 $43.4 $39,254.3 $36,538.7 
Debt$$5,119.6 $$5,119.6 $4,407.1 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
The following tables provide a summary of changes in fair value associated with Level 3 assets for the three and nine months ended September 30, 2020 and 2019:
  Level 3 Fair Value
(millions)Fair Value at June 30, 2020Calls/
Maturities/
Paydowns
PurchasesSalesNet Realized
(Gain)/Loss
on Sales
Change in
Valuation
Net
Transfers
In (Out)
Fair Value at September 30, 2020
Equity securities:
Nonredeemable preferred stocks:
Financials
$38.1 $$$$$$$38.1 
Industrials
15.2 15.2 
Common equities:
Other risk investments0.3 2.4 2.7 
Total Level 3 securities
$53.6 $$2.4 $$$$$56.0 
  Level 3 Fair Value
(millions)Fair Value at June 30, 2019Calls/
Maturities/
Paydowns
PurchasesSalesNet Realized
(Gain)/Loss
on Sales
Change in
Valuation
Net
Transfers
In (Out)
Fair Value at September 30, 2019
Equity securities:
Nonredeemable preferred stocks:
Financials
$27.1 $$$$$$$27.1 
Industrials
5.0 5.0 
Common equities:
Other risk investments0.3 0.3 
Total Level 3 securities
$32.4 $$$$$$$32.4 

  Level 3 Fair Value
(millions)Fair Value at December 31, 2019Calls/
Maturities/
Paydowns
PurchasesSalesNet Realized
(Gain)/Loss
on Sales
Change in
Valuation
Net
Transfers
In (Out)
Fair Value at September 30, 2020
Equity securities:
Nonredeemable preferred stocks:
Financials
$27.1 $$25.0 $$$(14.0)$$38.1 
Industrials
16.0 (0.8)15.2 
Common equities:
Other risk investments0.3 2.4 2.7 
Total Level 3 securities
$43.4 $$27.4 $$$(14.8)$$56.0 

  Level 3 Fair Value
(millions)Fair Value at December 31, 2018Calls/
Maturities/
Paydowns
PurchasesSalesNet Realized
(Gain)/Loss
on Sales
Change in
Valuation
Net
Transfers
In (Out)
Fair Value at September 30, 2019
Equity securities:
Nonredeemable preferred stocks:
Financials
$25.1 $$2.0 $$$$$27.1 
Industrials
5.0 5.0 
Common equities:
Other risk investments0.3 0.3 
Total Level 3 securities
$30.4 $$2.0 $$$$$32.4 
Fair Value Measurement Inputs and Valuation Techniques
The following tables provide a summary of the quantitative information about Level 3 fair value measurements for our applicable securities at September 30, 2020 and 2019, and December 31, 2019:
Quantitative Information about Level 3 Fair Value Measurements
($ in millions)Fair Value at September 30, 2020Valuation TechniqueUnobservable InputUnobservable Input Assumption
Equity securities:
Nonredeemable preferred stocks:
Financials$13.1 Guideline public company method Weighted average capitalization %(51.5)
Financials1
25.0 Internal priceUnadjusted purchase price per share3.7 
Industrials15.2 Guideline public company methodWeighted average capitalization %(19.2)
Subtotal Level 3 securities53.3 
Pricing exemption securities2.7 
Total Level 3 securities$56.0 
1 The security was purchased in May 2020 and the valuation remained the same at September 30, 2020.

Quantitative Information about Level 3 Fair Value Measurements
($ in millions)Fair Value at September 30, 2019Valuation TechniqueUnobservable InputUnobservable Input Assumption
Equity securities:
Nonredeemable preferred stocks:
Financials1
$27.1 Internal priceUnadjusted purchase price per share9.0 
Industrials5.0 Internal pricePrice-to-sales ratio5.5 
Subtotal Level 3 securities32.1 
Pricing exemption securities0.3 
Total Level 3 securities$32.4 
1 The security was purchased in December 2018.


Quantitative Information about Level 3 Fair Value Measurements
($ in millions)Fair Value at December 31, 2019Valuation TechniqueUnobservable InputUnobservable Input Assumption
Equity securities:
Nonredeemable preferred stocks:
Financials$27.1 Pricing firm Recent transaction price per share9.0 
Industrials6.0 Pricing firm Performance-based transaction price adjustment per share4.8 
Industrials1
10.0 Internal priceUnadjusted purchase price per share4.9 
Subtotal Level 3 securities43.1 
Pricing exemption securities0.3 
Total Level 3 securities$43.4 
1 The security was purchased in November 2019.