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Goodwill and Other Intangible Assets - Goodwill and Intangible Assets (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Goodwill [Line Items] |  |
Goodwill | $ 1,321.9 | $ 1,343.0
Finite-lived: |  |
Gross | 467.3 | 472.9
Accumulated Amortization | 353.5 | 339.9
Net | 113.8 | 133.0
Indefinite-lived: |  |
Gross | 150.8 | 151.0
Net | 150.8 | 151.0
Total intangible assets |  |
Gross | 618.1 | 623.9
Accumulated Amortization | 353.5 | 339.9
Net | 264.6 | 284.0
Accumulated impairment loss | 513.4 | 513.4
Intangible Assets, Future Amortization Expense by Fiscal Year [Abstract] |  |
Estimated amortization expense, remainder of 2018 | 16.5 |
Estimated amortization expense, 2019 | 29.3 |
Estimated amortization expense, 2020 | 24.7 |
Estimated amortization expense, 2021 | 13.7 |
Estimated amortization expense, 2022 | 10.1 |
Estimated amortization expense, 2023 | 7.9 |
Tradenames |  |
Indefinite-lived: |  |
Gross | 52.0 | 52.0
Net | 52.0 | 52.0
Accumulated impairment loss | 139.5 | 139.5
Reacquired franchise rights |  |
Indefinite-lived: |  |
Gross | 98.8 | 99.0
Net | 98.8 | 99.0
Customer relationships |  |
Finite-lived: |  |
Gross | 448.6 | 453.6
Accumulated Amortization | 338.0 | 325.2
Net | 110.6 | 128.4
Other |  |
Finite-lived: |  |
Gross | 18.7 | 19.3
Accumulated Amortization | 15.5 | 14.7
Net | $ 3.2 | $ 4.6

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