Investment Income and Gains and Losses (Tables)

12 Months Ended

Dec. 31, 2018

Investments Debt And Equity Securities [Abstract]

Components of Net Investment Income from Continuing Operations

The components of net investment income from continuing operations were as follows:

YEARS ENDED DECEMBER 31	2018			2017			2016
(in millions)
Fixed maturities	$	217.7		$	205.8		$	202.1
Limited partnerships		24.1			15.3			8.0
Equity securities		17.0			18.0			18.6
Mortgage loans		14.0			11.4			9.1
Other investments		4.8			3.4			3.4
Gross investment income		277.6			253.9			241.2
Less investment expenses		(10.2	)		(10.0	)		(9.6	)
Net investment income	$	267.4		$	243.9		$	231.6

Schedule of Net Realized and Unrealized Gains (Losses) on Investments from Continuing Operations Including OTTI

Net realized and unrealized gains (losses) on investments from continuing operations, including OTTI, were as follows:

YEARS ENDED DECEMBER 31	2018			2017			2016
(in millions)
Equity securities	$	(43.4	)	$	19.8		$	25.4
Fixed maturities		(5.8	)		3.6			(15.5	)
Other investments		(1.5	)		(2.3	)		0.3
Net realized and unrealized investment gains (losses)	$	(50.7	)	$	21.1		$	10.2

Schedule of Pre-tax Net Realized and Unrealized Losses on Equity Securities

The following table provides pre-tax net realized and unrealized losses on equity securities from continuing operations:

YEAR ENDED DECEMBER 31		2018
(in millions)
Net losses recognized during the period	$	(43.4	)
Less: net losses recognized on equity securities sold during the period		(3.9	)
Net unrealized losses recognized during the period on equity securities still held	$	(39.5	)

Rollforward of Cumulative Amounts Related to Credit Loss Portion of OTTI Losses

The following table provides rollforwards of the cumulative amounts related to the Company’s credit loss portion of the OTTI losses on fixed maturity securities from continuing operations for which the non-credit portion of the loss is included in other comprehensive income.

YEARS ENDED DECEMBER 31	2018			2017			2016
(in millions)
Credit losses as of the beginning of the year	$	3.6		$	9.6		$	17.7
Credit losses on securities for which an OTTI was not    previously recognized		1.0			0.4			6.1
Additional credit losses on securities for which an OTTI was    previously  recognized		0.1			0.1			2.3
Reductions for securities sold, matured or called		(0.9	)		(6.1	)		(4.3	)
Reductions for securities reclassified as intend to sell		—			(0.4	)		(12.2	)
Credit losses as of the end of the year	$	3.8		$	3.6		$	9.6

Schedule of Realized Gain (Loss)

The proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses on those sales, were as follows:

YEARS ENDED DECEMBER 31
(in millions)
	Proceeds		Gross		Gross
2018	from Sales		Gains		Losses
Fixed maturities, excluding held-for-sale (Chaucer)	$	296.5	$	2.1	$	8.4
Fixed maturities, held-for-sale		276.8		1.7		1.7
Total fixed maturities	$	573.3	$	3.8	$	10.1
2017
Fixed maturities, excluding held-for-sale (Chaucer)	$	306.8	$	8.1	$	7.8
Fixed maturities, held-for-sale		188.0		4.1		0.4
Total fixed maturities	$	494.8	$	12.2	$	8.2
2016
Fixed maturities, excluding held-for-sale (Chaucer)	$	348.2	$	10.0	$	5.1
Fixed maturities, held-for-sale		215.6		1.7		1.9
Total fixed maturities	$	563.8	$	11.7	$	7.0