Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2019

Equity [Abstract]

Changes in Other Comprehensive Income (Loss)

The following tables provide changes in other comprehensive income (loss).

	Three Months Ended March 31,
	2019								2018
			Tax									Tax
			Benefit			Net of						Benefit			Net of
(in millions)	Pre-Tax		(Expense)			Tax			Pre-Tax			(Expense)			Tax
Unrealized gains (losses) on available-for-sale    securities:
Unrealized gains (losses) arising during period	$	152.0	$	(32.0	)	$	120.0		$	(153.7	)	$	32.1		$	(121.6	)
Amount of realized gains (losses) from sales    and other		0.3		(3.9	)		(3.6	)		0.2			(2.5	)		(2.3	)
Portion of other-than-temporary impairment    losses recognized in earnings		—		—			—			0.5			(0.1	)		0.4
Net unrealized gains (losses)		152.3		(35.9	)		116.4			(153.0	)		29.5			(123.5	)
Pension and postretirement benefits:
Net change in net actuarial loss and prior    service cost		2.9		(0.6	)		2.3			(2.9	)		0.6			(2.3	)
Cumulative foreign currency translation adjustment:
Foreign currency translation recognized during    the period		0.1		—			0.1			(0.6	)		0.1			(0.5	)
Other comprehensive income (loss)	$	155.3	$	(36.5	)	$	118.8		$	(156.5	)	$	30.2		$	(126.3	)

Reclassifications Out of Accumulated Other Comprehensive Income

Reclassifications out of accumulated other comprehensive income were as follows:

	Three Months Ended
	March 31,
(in millions)	2019			2018
	Amount Reclassified from
Details about Accumulated Other	Accumulated Other						Affected Line Item in the Statement
Comprehensive Income Components	Comprehensive Income						Where Net Income is Presented
Unrealized gains on available-for-sale    securities	$	(0.3	)	$	—		Net realized losses from sales and other
		—			(0.6	)	Net other-than-temporary impairment losses on    investments recognized in earnings
		(0.3	)		(0.6	)	Total before tax
		3.9			2.7		Tax benefit
		3.6			2.1		Continued operations; net of tax
		—			(0.2	)	Discontinued operations - Chaucer business
		3.6			1.9		Net of tax
Amortization of defined benefit    pension and postretirement plans		(2.9	)		(2.5	)	Loss adjustment expenses and other    operating expenses (1)
		0.6			0.5		Tax benefit
		(2.3	)		(2.0	)	Continued operations; net of tax
Total reclassifications for the period	$	1.3		$	(0.1	)	Benefit (expense) reflected in income, net of tax

(1) The amount reclassified from accumulated other comprehensive income for the pension and postretirement benefits was allocated approximately 40% to loss adjustment expenses and 60% to other operating expenses for the three months ended March 31, 2019 and 2018.