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Intangible Assets | 3 Months Ended
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Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets Our identifiable intangible assets primarily consist of acquired permits and leasehold agreements, and franchise agreements, which grant us the right to operate out-of-home structures in specified locations and the right to provide advertising space on railroad and municipal transit properties. Identifiable intangible assets are amortized on a straight-line basis over their estimated useful life, which is the respective life of the agreement that in some cases includes historical experience of renewals. Our identifiable intangible assets consist of the following:
(in millions) |  | Gross |  | Accumulated Amortization |  | Net
As of March 31, 2022: |  |  |  |  |  |
Permits and leasehold agreements |  | $ | 1,311.8 |  |  | $ | (828.3) |  |  | $ | 483.5 |
Franchise agreements |  | 529.3 |  |  | (405.4) |  |  | 123.9 |
Other intangible assets |  | 4.9 |  |  | (2.8) |  |  | 2.1 |
Total intangible assets |  | $ | 1,846.0 |  |  | $ | (1,236.5) |  |  | $ | 609.5 |
As of December 31, 2021: |  |  |  |  |  |
Permits and leasehold agreements |  | $ | 1,303.6 |  |  | $ | (816.5) |  |  | $ | 487.1 |
Franchise agreements |  | 528.2 |  |  | (402.7) |  |  | 125.5 |
Other intangible assets |  | 4.9 |  |  | (2.6) |  |  | 2.3 |
Total intangible assets |  | $ | 1,836.7 |  |  | $ | (1,221.8) |  |  | $ | 614.9 |
In the three months ended March 31, 2022, we acquired 15 displays, resulting in amortizable intangible assets for permits and leasehold agreements of $6.1 million, which are amortized using the straight-line method over their estimated useful lives, an average period of 13.4 years. All of our intangible assets, except goodwill, are subject to amortization. Amortization expense was $14.8 million in the three months ended March 31, 2022, and $16.4 million in the three months ended March 31, 2021.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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