Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

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 December 31:

(millions)	2019		2018
Intangible assets subject to amortization	$	215.9	$	282.2
Indefinite-lived intangible assets1	12.4		12.4
Total	$	228.3	$	294.6

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 State insurance licenses were previously subject to amortization under superseded accounting guidance and have $0.6 million of accumulated amortization for both years presented.

Intangible Assets Subject to Amortization

Intangible assets subject to amortization for the years ended December 31, consisted of the following:

(millions)	2019						2018
Category	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Policies in force	$	256.2	$	173.9	$	82.3	$	256.2	$	137.3	$	118.9
Agency relationships	159.2		54.0		105.2		159.2		42.6		116.6
Software rights	79.1		50.7		28.4		79.1		40.1		39.0
Trade name	34.8		34.8		0		34.8		27.1		7.7
Total	$	529.3	$	313.4	$	215.9	$	529.3	$	247.1	$	282.2

Amortization on Intangible Assets

The estimated aggregate amortization on these intangible assets for each of the next five years as of December 31, 2019, follows:

(millions)
Year	Amortization Expense
2020	$	56.9
2021	56.6
2022	29.2
2023	13.5
2024	11.4