Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Net Carrying Amount of Other Intangible Assets

The following table is a summary of the net carrying amount of other intangible assets as of September 30, 2017 and 2016, and December 31, 2016:

(millions)	September 30, 2017		September 30, 2016		December 31, 2016
Intangible assets subject to amortization	$	372.2	$	435.9	$	420.4
Indefinite-lived intangible assets1	12.4		12.4		12.4
Total	$	384.6	$	448.3	$	432.8

¹ Indefinite-lived intangible assets are comprised of state insurance and agent licenses. State insurance licenses were previously subject to amortization under superseded accounting guidance and have $0.6 million of accumulated amortization for all periods presented.

Intangible Assets Subject to Amortization

Intangible assets subject to amortization consisted of the following:

(millions)	September 30, 2017						September 30, 2016						December 31, 2016
Category	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Policies in force	$	256.2	$	91.5	$	164.7	$	256.2	$	55.0	$	201.2	$	256.2	$	64.1	$	192.1
Agency relationships	159.2		28.4		130.8		159.2		17.1		142.1		159.2		19.9		139.3
Software rights	79.1		26.8		52.3		79.1		16.1		63.0		79.1		18.8		60.3
Trade name	34.8		10.4		24.4		34.8		5.2		29.6		34.8		6.1		28.7
Total	$	529.3	$	157.1	$	372.2	$	529.3	$	93.4	$	435.9	$	529.3	$	108.9	$	420.4