Other Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Changes in Other Comprehensive Income

The following tables provide changes in other comprehensive income.

	Three Months Ended June 30,
	2018									2017
				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	$	(58.1	)	$	12.4		$	(45.7	)	$	41.0		$	(14.5	)	$	26.5
Amount of realized gains (losses) from sales    and other		—			(3.3	)		(3.3	)		(7.2	)		(0.7	)		(7.9	)
Portion of other-than-temporary impairment    losses recognized in earnings		(0.1	)		—			(0.1	)		1.8			(0.6	)		1.2
Net unrealized gains (losses)		(58.2	)		9.1			(49.1	)		35.6			(15.8	)		19.8
Pension and postretirement benefits:
Net change in net actuarial loss and prior    service cost		1.1			(0.2	)		0.9			3.5			(1.1	)		2.4
Cumulative foreign currency translation adjustment:
Foreign currency translation recognized during    the period		(0.6	)		0.1			(0.5	)		(6.9	)		2.4			(4.5	)
Other comprehensive income (loss)	$	(57.7	)	$	9.0		$	(48.7	)	$	32.2		$	(14.5	)	$	17.7

	Six Months Ended June 30,
	2018									2017
				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	$	(211.8	)	$	44.5		$	(167.3	)	$	79.0		$	(27.8	)	$	51.2
Amount of realized gains (losses) from    sales and other		0.2			(5.8	)		(5.6	)		(11.3	)		(2.4	)		(13.7	)
Portion of other-than-temporary impairment    losses recognized in earnings		0.4			(0.1	)		0.3			2.0			(0.7	)		1.3
Net unrealized gains (losses)		(211.2	)		38.6			(172.6	)		69.7			(30.9	)		38.8
Pension and postretirement benefits:
Net change in net actuarial loss and prior    service cost		(1.8	)		0.4			(1.4	)		7.0			(2.3	)		4.7
Cumulative foreign currency translation adjustment:
Foreign currency translation recognized during    the period		(1.2	)		0.2			(1.0	)		0.9			(0.3	)		0.6
Other comprehensive income (loss)	$	(214.2	)	$	39.2		$	(175.0	)	$	77.6		$	(33.5	)	$	44.1

Reclassifications Out of Accumulated Other Comprehensive Income

Reclassifications out of accumulated other comprehensive income were as follows:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
(in millions)	2018			2017			2018			2017
	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	$	—		$	7.2		$	(0.2	)	$	11.3		Net realized gains (losses) from sales and other
													Net other-than-temporary impairment
		0.1			(1.8	)		(0.4	)		(2.0	)	losses on investments recognized in earnings
		0.1			5.4			(0.6	)		9.3		Total before tax
		3.3			1.3			5.9			3.1		Tax benefit
		3.4			6.7			5.3			12.4		Net of tax
Amortization of defined benefit													Loss adjustment expenses and other
pension and postretirement plans		(2.3	)		(3.5	)		(4.8	)		(7.0	)	operating expenses
		0.5			1.1			1.0			2.3		Tax benefit
		(1.8	)		(2.4	)		(3.8	)		(4.7	)	Net of tax
Total reclassifications for the period	$	1.6		$	4.3		$	1.5		$	7.7		Benefit to income, net of tax