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Segment Data - Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services | $ 5,393.2 | $ 5,418.7 | $ 5,656.9 | $ 5,522.4 | $ 5,637.5 | $ 5,464.8 | $ 5,174.8 | $ 4,757.2 | $ 21,991.2 | $ 21,034.3 | $ 19,654.1
Operating Unit Profit |  |  |  |  |  |  |  |  | 941.8 | 932.2 | 874.3
Corporate expenses |  |  |  |  |  |  |  |  | (110.0) | (108.4) | (92.8)
Intangible asset amortization expense |  |  |  |  |  |  |  |  | (35.1) | (34.6) | (36.0)
Interest and other expenses |  |  |  |  |  |  |  |  | (42.0) | (51.9) | (44.2)
Earnings before income taxes |  |  |  |  |  |  |  |  | 754.7 | 737.3 | 701.3
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  | 85.8 | 84.4 | 85.3
Earnings from Equity Investments |  |  |  |  |  |  |  |  | 1.2 | 15.0 | 3.6
Total Assets | 8,519.8 |  |  |  | 8,883.6 |  |  |  | 8,519.8 | 8,883.6 | 7,574.2
Equity Investments | 161.4 |  |  |  | 158.7 |  |  |  | 161.4 | 158.7 | 145.8
Long-Lived Assets | 160.0 |  |  |  | 161.3 |  |  |  | 160.0 | 161.3 | 150.6
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 60.3 | 53.9 | 54.6
Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 4,159.3 | 4,216.4 | 4,297.2
Operating Unit Profit |  |  |  |  |  |  |  |  | 203.9 | 213.3 | 195.9
Earnings from Equity Investments |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Americas | United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 2,522.3 | 2,659.0 | 2,836.8
Operating Unit Profit |  |  |  |  |  |  |  |  | 130.8 | 152.1 | 142.3
Earnings from Equity Investments |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Americas | Other Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 1,637.0 | 1,557.4 | 1,460.4
Operating Unit Profit |  |  |  |  |  |  |  |  | 73.1 | 61.2 | 53.6
Earnings from Equity Investments |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Southern Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 9,371.6 | 8,657.0 | 7,497.6
Operating Unit Profit |  |  |  |  |  |  |  |  | 467.6 | 443.9 | 378.8
Earnings from Equity Investments |  |  |  |  |  |  |  |  | 1.5 | 15.0 | 3.6
Southern Europe | France |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 5,827.7 | 5,477.2 | 4,837.4
Operating Unit Profit |  |  |  |  |  |  |  |  | 290.4 | 280.0 | 252.5
Earnings from Equity Investments |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Southern Europe | Italy |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 1,670.6 | 1,475.9 | 1,167.7
Operating Unit Profit |  |  |  |  |  |  |  |  | 111.1 | 104.5 | 79.1
Earnings from Equity Investments |  |  |  |  |  |  |  |  | (0.2) | 0.0 | 0.0
Southern Europe | Other Southern Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 1,873.3 | 1,703.9 | 1,492.5
Operating Unit Profit |  |  |  |  |  |  |  |  | 66.1 | 59.4 | 47.2
Earnings from Equity Investments |  |  |  |  |  |  |  |  | 1.7 | 15.0 | 3.6
Northern Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 5,370.5 | 5,306.4 | 5,129.1
Operating Unit Profit |  |  |  |  |  |  |  |  | 122.7 | 140.1 | 166.4
Earnings from Equity Investments |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
APME |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 2,890.3 | 2,636.4 | 2,471.3
Operating Unit Profit |  |  |  |  |  |  |  |  | 114.8 | 98.9 | 88.5
Earnings from Equity Investments |  |  |  |  |  |  |  |  | (0.3) | 0.0 | 0.0
Right Management |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  | 199.5 | 218.1 | 258.9
Operating Unit Profit |  |  |  |  |  |  |  |  | 32.8 | 36.0 | 44.7
Earnings from Equity Investments |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Reportable segments | Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  | 10.4 | 11.8 | 12.6
Total Assets | 2,168.9 |  |  |  | 2,110.6 |  |  |  | 2,168.9 | 2,110.6 | 2,033.3
Equity Investments | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0
Long-Lived Assets | 25.6 |  |  |  | 26.7 |  |  |  | 25.6 | 26.7 | 34.0
Reportable segments | Americas | United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  | 8.2 | 9.3 | 9.9
Total Assets | 1,827.4 |  |  |  | 1,781.4 |  |  |  | 1,827.4 | 1,781.4 | 1,718.9
Equity Investments | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0
Long-Lived Assets | 19.6 |  |  |  | 20.6 |  |  |  | 19.6 | 20.6 | 27.7
Reportable segments | Americas | Other Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  | 2.2 | 2.5 | 2.7
Total Assets | 341.5 |  |  |  | 329.2 |  |  |  | 341.5 | 329.2 | 314.4
Equity Investments | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0
Long-Lived Assets | 6.0 |  |  |  | 6.1 |  |  |  | 6.0 | 6.1 | 6.3
Reportable segments | Southern Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  | 20.7 | 18.8 | 16.4
Total Assets | 3,711.4 |  |  |  | 3,786.0 |  |  |  | 3,711.4 | 3,786.0 | 2,889.8
Equity Investments | 158.1 |  |  |  | 157.6 |  |  |  | 158.1 | 157.6 | 139.7
Long-Lived Assets | 77.6 |  |  |  | 77.1 |  |  |  | 77.6 | 77.1 | 62.4
Reportable segments | Southern Europe | France |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  | 14.0 | 12.3 | 11.0
Total Assets | 2,729.7 |  |  |  | 2,753.1 |  |  |  | 2,729.7 | 2,753.1 | 2,104.8
Equity Investments | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.2
Long-Lived Assets | 49.2 |  |  |  | 47.9 |  |  |  | 49.2 | 47.9 | 39.7
Reportable segments | Southern Europe | Italy |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  | 1.9 | 1.8 | 1.9
Total Assets | 405.0 |  |  |  | 436.7 |  |  |  | 405.0 | 436.7 | 294.9
Equity Investments | 0.3 |  |  |  | 0.4 |  |  |  | 0.3 | 0.4 | 0.4
Long-Lived Assets | 5.0 |  |  |  | 4.9 |  |  |  | 5.0 | 4.9 | 4.4
Reportable segments | Southern Europe | Other Southern Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  | 4.8 | 4.7 | 3.5
Total Assets | 576.7 |  |  |  | 596.2 |  |  |  | 576.7 | 596.2 | 490.1
Equity Investments | 157.8 |  |  |  | 157.2 |  |  |  | 157.8 | 157.2 | 139.1
Long-Lived Assets | 23.4 |  |  |  | 24.3 |  |  |  | 23.4 | 24.3 | 18.3
Reportable segments | Northern Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  | 11.0 | 10.6 | 10.9
Total Assets | 1,237.0 |  |  |  | 1,569.0 |  |  |  | 1,237.0 | 1,569.0 | 1,292.4
Equity Investments | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.1
Long-Lived Assets | 29.9 |  |  |  | 28.0 |  |  |  | 29.9 | 28.0 | 25.4
Reportable segments | APME |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  | 5.7 | 4.7 | 5.3
Total Assets | 754.0 |  |  |  | 780.7 |  |  |  | 754.0 | 780.7 | 612.8
Equity Investments | 2.3 |  |  |  | 0.1 |  |  |  | 2.3 | 0.1 | 0.0
Long-Lived Assets | 21.5 |  |  |  | 21.4 |  |  |  | 21.5 | 21.4 | 17.9
Reportable segments | Right Management |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  | 2.8 | 3.7 | 3.9
Total Assets | 127.6 |  |  |  | 138.1 |  |  |  | 127.6 | 138.1 | 136.6
Equity Investments | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 | 0.0 | 0.0
Long-Lived Assets | 5.3 |  |  |  | 8.0 |  |  |  | 5.3 | 8.0 | 10.7
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  | 0.1 | 0.2 | 0.2
Total Assets | 520.9 |  |  |  | 499.2 |  |  |  | 520.9 | 499.2 | 609.3
Equity Investments | 1.0 |  |  |  | 1.0 |  |  |  | 1.0 | 1.0 | 6.0
Long-Lived Assets | $ 0.1 |  |  |  | $ 0.1 |  |  |  | 0.1 | 0.1 | 0.2
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 0.1 | 0.0 | 0.0
Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible asset amortization expense |  |  |  |  |  |  |  |  | (35.1) | (34.6) | (36.0)
Segment Reconciling Items | Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 10.4 | 9.1 | 13.8
Segment Reconciling Items | Americas | United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 7.6 | 6.7 | 11.9
Segment Reconciling Items | Americas | Other Americas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 2.8 | 2.4 | 1.9
Segment Reconciling Items | Southern Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 26.2 | 25.7 | 23.9
Segment Reconciling Items | Southern Europe | France |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 18.1 | 15.2 | 13.3
Segment Reconciling Items | Southern Europe | Italy |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 2.2 | 1.7 | 1.7
Segment Reconciling Items | Southern Europe | Other Southern Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 5.9 | 8.8 | 8.9
Segment Reconciling Items | Northern Europe |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 16.6 | 11.8 | 8.5
Segment Reconciling Items | APME |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | 6.8 | 6.3 | 3.9
Segment Reconciling Items | Right Management |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  | $ 0.2 | $ 1.0 | $ 4.5

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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