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Summary of Significant Accounting Policies (Details) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares
Revenue, remaining performance obligation, amount | $ 770.0 |  |
Retirement of treasury stock, amount | $ 0.0 | $ 0.0 | $ 0.0
ERP Systems, Useful Life | 10 |  |
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 | 13 |  |
Foreign Currency Transaction pre-tax Gain (Loss) | $ 5.6 | $ 1.9 | $ 2.1
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 |  |
Common Stock [Member] |  |  |
Retirement of treasury stock, shares | shares | (8.1) | (13.4) | (13.7)
Retirement of treasury stock, amount | $ (0.8) | $ (1.3) | $ (1.4)
Treasury Stock [Member] |  |  |
Retirement of treasury stock, amount | 176.1 | 304.4 | 311.0
Additional Paid-in Capital [Member] |  |  |
Retirement of treasury stock, amount | $ (175.3) | $ (303.1) | $ (309.6)

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