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Summary of Significant Accounting Policies (Details) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares
Retirement of treasury stock, amount | $ 0.0 | $ 0.0 | $ 0.0
ERP Systems, Useful Life | 10 |  |
Selling, general and administrative expense | $ 118.6 | 138.8 |
Depreciation and amortization | $ 157.1 | 160.2 | 157.0
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 | 11 |  |
Foreign Currency Transaction pre-tax Gain (Loss) | $ 1.9 | $ 2.1 | $ 2.0
Minimum |  |  |
Furniture and Equipment, Useful Life | 3 years |  |
Buildings, Useful Life | 10 years |  |
Other Internal Use Software, Useful Life | 3 |  |
Finite-Lived 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 |  |
Finite-Lived Intangible Assets, Useful Life | 15 years |  |
Common Stock [Member] |  |  |
Retirement of treasury stock, shares | shares | (13.4) | (13.7) | (11.3)
Retirement of treasury stock, amount | $ (1.3) | $ (1.4) | $ (1.2)
Treasury Stock [Member] |  |  |
Retirement of treasury stock, amount | 304.4 | 311.0 | 233.2
Additional Paid-in Capital [Member] |  |  |
Retirement of treasury stock, amount | $ (303.1) | $ (309.6) | $ (232.0)

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