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Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Goodwill [Line Items] |  |  |
Goodwill | $ 1,257.4 | $ 1,075.2 | $ 1,090.9
Accumulated impairment loss | 513.4 | 513.4 | 513.4
Finite-lived: |  |  |
Gross | 442.5 | 411.7 |
Accumulated Amortization | 266.6 | 276.2 |
Net | 175.9 | 135.5 |
Indefinite-lived: |  |  |
Gross | 150.6 | 151.3 |
Accumulated Amortization | 0.0 | 0.0 |
Net | 150.6 | 151.3 |
Total intangible assets |  |  |
Gross | 593.1 | 563.0 |
Accumulated Amortization | 266.6 | 276.2 |
Net | 326.5 | 286.8 |
Amortization expense related to intangibles | 32.8 | 33.4 | $ 34.1
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
2016 | 34.8 |  |
2017 | 31.8 |  |
2018 | 29.0 |  |
2019 | 24.7 |  |
2020 | $ 20.2 |  |
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) | 11.80% |  |
Maximum |  |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
Discount rate for goodwill impairment test (as a percent) | 17.10% |  |
Tradenames |  |  |
Indefinite-lived: |  |  |
Gross | $ 54.0 | 54.0 |
Accumulated Amortization | 0.0 | 0.0 |
Net | 54.0 | 54.0 |
Accumulated impairment loss | 139.5 | 139.5 |
Reacquired franchise rights |  |  |
Indefinite-lived: |  |  |
Gross | 96.6 | 97.3 |
Accumulated Amortization | 0.0 | 0.0 |
Net | 96.6 | 97.3 |
Technology |  |  |
Finite-lived: |  |  |
Gross | 0.0 | 19.6 |
Accumulated Amortization | 0.0 | 19.6 |
Net | 0.0 | 0.0 |
Franchise agreements |  |  |
Finite-lived: |  |  |
Gross | 0.0 | 18.0 |
Accumulated Amortization | 0.0 | 18.0 |
Net | 0.0 | 0.0 |
Customer relationships |  |  |
Finite-lived: |  |  |
Gross | 425.6 | 359.9 |
Accumulated Amortization | 256.7 | 225.6 |
Net | $ 168.9 | 134.3 |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
Weighted-average useful lives | 13 years |  |
Other |  |  |
Finite-lived: |  |  |
Gross | $ 16.9 | 14.2 |
Accumulated Amortization | 9.9 | 13.0 |
Net | $ 7.0 | $ 1.2 |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |
Weighted-average useful lives | 4 years |  |

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