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Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |  |
Goodwill | $ 1,297,100,000 | $ 1,343,000,000 | $ 1,239,900,000
Finite-lived: |  |  |
Gross | 463,300,000 | 472,900,000 |
Accumulated Amortization | 367,700,000 | 339,900,000 |
Net | 95,600,000 | 133,000,000 |
Indefinite-lived: |  |  |
Gross | 150,700,000 | 151,000,000 |
Net | 150,700,000 | 151,000,000 |
Total intangible assets |  |  |
Gross | 614,000,000 | 623,900,000 |
Accumulated Amortization | 367,700,000 | 339,900,000 |
Net | 246,300,000 | 284,000,000 |
Goodwill, accumulated impairment loss | 513,400,000 | 513,400,000 | 513,400,000
Amortization expense related to intangibles | 35,100,000 | 34,600,000 | 36,000,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
2019 | 29,000,000 |  |
2020 | 24,200,000 |  |
2021 | 13,400,000 |  |
2022 | 9,900,000 |  |
2023 | 7,700,000 |  |
Impairment of goodwill | $ 0 | 0 | $ 0
Income approach weight for goodwill impairment for certain reporting units | 75.00% |  |
Market approach weight for goodwill impairment for certain reporting units | 25.00% |  |
Minimum |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
Discount rate for goodwill impairment test (as a percent) | 10.60% |  |
Maximum |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
Discount rate for goodwill impairment test (as a percent) | 14.20% |  |
Tradenames |  |  |
Indefinite-lived: |  |  |
Gross | $ 52,000,000 | 52,000,000 |
Net | 52,000,000 | 52,000,000 |
Total intangible assets |  |  |
Trademarks, accumulated impairment loss | 139,500,000 | 139,500,000 |
Reacquired franchise rights |  |  |
Indefinite-lived: |  |  |
Gross | 98,700,000 | 99,000,000 |
Net | 98,700,000 | 99,000,000 |
Customer relationships |  |  |
Finite-lived: |  |  |
Gross | 444,800,000 | 453,600,000 |
Accumulated Amortization | 351,700,000 | 325,200,000 |
Net | $ 93,100,000 | 128,400,000 |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
Weighted-average useful lives | 13 years |  |
Other |  |  |
Finite-lived: |  |  |
Gross | $ 18,500,000 | 19,300,000 |
Accumulated Amortization | 16,000,000 | 14,700,000 |
Net | $ 2,500,000 | $ 4,600,000 |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
Weighted-average useful lives | 4 years |  |

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