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Summary of Significant Accounting Policies (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2019 USD ($)
Operating Lease, Right-of-Use Asset | $ 1,544.4 | $ 1,379.3 |  | $ 1,421.1
Operating Lease, Liability | 1,841.8 |  |  | $ 1,544.4
Revenue, remaining performance obligation, amount | $ 605.1 |  |  |
ERP Systems, Useful Life | 10 |  |  |
Minimum Remaining Lease Term | 1 year |  |  |
Maximum Remaining Lease Term | 15 years |  |  |
Leasehold Improvements, Useful Life | the shorter of the useful life or the remaining lease term |  |  |
Number of Reporting Units for Purposes of Annual Goodwill Impairment Test | 9 |  |  |
Foreign Currency Transaction pre-tax Gain (Loss) | $ 5.0 | $ (1.2) | $ 5.3 |
Minimum |  |  |  |
Furniture and Equipment, Useful Life | 3 years |  |  |
Buildings, Useful Life | 10 years |  |  |
Other Internal Use Software, Useful Life | 3 |  |  |
Identifiable Intangible Assets, Useful Life | 7 years |  |  |
Maximum |  |  |  |
Furniture and Equipment, Useful Life | 7 years |  |  |
Buildings, Useful Life | 35 years |  |  |
Other Internal Use Software, Useful Life | 7 |  |  |
Identifiable Intangible Assets, Useful Life | 15 years |  |  |

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