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Acquisitions (Details) In Millions, except Per Share data, unless otherwise specified | 9 Months Ended | 12 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2011 USD ($) | Sep. 30, 2010 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Sep. 30, 2011 Proservia SA [Member] EUR (€) | Sep. 22, 2011 Proservia SA [Member]
Acquisitions [Abstract] |  |  |  |  |  |  |  |  |  |
Amount of cash consideration paid for acquisitions | $ 32.1 | $ 260.6 |  |  |  |  |  |  |  |
Estimated amortization expense, remainder of the current fiscal year |  |  |  |  |  |  |  | 10.0 |  |
Estimated amortization expense, Year 1 |  |  |  |  |  |  | 35.9 |  |  |
Estimated amortization expense, Year 2 |  |  |  |  |  | 31.1 |  |  |  |
Estimated amortization expense, Year 3 |  |  |  |  | 25.9 |  |  |  |  |
Estimated amortization expense, Year 4 |  |  |  | 22.6 |  |  |  |  |  |
Estimated amortization expense, Year 5 |  |  | $ 19.4 |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition date |  |  |  |  |  |  |  |  | 2011-09-22 |
Shares and voting rights acquired (in hundredths) |  |  |  |  |  |  |  |  |  | 70.00%
Acquisition cost (in Euro per share) |  |  |  |  |  |  |  |  | € 14.89 |

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