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Summary of Significant Accounting Policies - Schedule of Goodwill, Finite-Lived Intangible Assets and Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Goodwill [Line Items] |  |  |
Goodwill | $ 1,225.8 | $ 1,260.1 | $ 1,297.1
Finite-lived: |  |  |
Gross | 494.9 | 481.4 |
Accumulated Amortization | 425.4 | 389.4 |
Net | 69.5 | 92.0 |
Indefinite-lived: |  |  |
Gross | 179.1 | 176.6 |
Total intangible assets |  |  |
Gross | 674.0 | 658.0 |
Accumulated Amortization | 425.4 | 389.4 |
Net | 248.6 | 268.6 |
Tradenames |  |  |
Indefinite-lived: |  |  |
Gross | 52.0 | 52.0 |
Reacquired franchise rights |  |  |
Indefinite-lived: |  |  |
Gross | 127.1 | 124.6 |
Customer relationships |  |  |
Finite-lived: |  |  |
Gross | 473.0 | 460.5 |
Accumulated Amortization | 403.8 | 375.7 |
Net | 69.2 | 84.8 |
Other |  |  |
Finite-lived: |  |  |
Gross | 21.9 | 20.9 |
Accumulated Amortization | 21.6 | 13.7 |
Net | $ 0.3 | $ 7.2 |

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