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Reportable Business Segments and International Operations, Reconciliation of Segment Assets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Reconciliation of segment assets to consolidated total assets |  |  |
Segment assets excluding goodwill | $ 6,887.0 | $ 5,875.6 |
Goodwill | 5,032.1 | 4,867.1 | $ 4,103.2
Other assets | 408.2 | 72.8 |
Total assets | $ 12,327.3 | $ 10,815.5 |

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