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Amortizable Intangible Assets - Amortizable Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying value |  | $ 3,171.5 | $ 2,992.5
Accumulated amortization |  | (1,550.7) | (1,397.3)
Net carrying value |  | 1,620.8 | 1,595.2
Foreign currency translation, Gross carrying value |  | 33.5 | (4.5)
Foreign currency translation, Accumulated amortization |  | (2.0) | 0.4
Foreign currency translation, Net carrying value |  | 31.5 | (4.1)
Purchased Customer Accounts |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying value, excluding foreign currency translation |  | 3,138.0 | 2,997.0
Accumulated amortization, excluding foreign currency translation |  | (1,548.7) | (1,397.7)
Net carrying value, excluding foreign currency translation |  | $ 1,589.3 | $ 1,599.3
Weighted average life (years) | [1] | 14 years 9 months 18 days | 14 years 9 months 18 days
[1] | Weighted average life calculated as of the date of acquisition.

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