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Segment Data - Schedule of Segment Data (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues from Services | $ 5,054,900,000 | $ 4,584,800,000 | $ 3,742,200,000 | $ 4,619,100,000 | $ 5,196,600,000 | $ 5,248,900,000 | $ 5,373,100,000 | $ 5,044,900,000 |  | $ 18,001,000,000.0 | $ 20,863,500,000 | $ 21,991,200,000
Operating Unit Profit (Loss) |  |  |  |  |  |  |  |  |  | 395,500,000 | 860,600,000 | 941,800,000
Corporate expenses |  |  |  |  |  |  |  |  |  | (113,900,000) | (121,900,000) | (110,000,000.0)
Impairment charge |  | $ 0 |  |  |  | $ 0 |  |  | $ 0 | (66,800,000) | (64,000,000.0) |
Intangible asset amortization expense |  |  |  |  |  |  |  |  |  | (27,200,000) | (29,800,000) | (35,100,000)
Interest and other (expenses) income, net |  |  |  |  |  |  |  |  |  | (39,900,000) | 40,600,000 | (42,000,000.0)
Earnings before income taxes |  |  |  |  |  |  |  |  |  | 147,700,000 | 685,500,000 | 754,700,000
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  | 76,300,000 | 77,200,000 | 85,800,000
Earnings from Equity Investments |  |  |  |  |  |  |  |  |  | 4,600,000 | 50,500,000 | 1,200,000
Total Assets | 9,328,200,000 |  |  |  | 9,223,800,000 |  |  |  |  | 9,328,200,000 | 9,223,800,000 | 8,519,800,000
Equity Investments | 106,600,000 |  |  |  | 97,800,000 |  |  |  |  | 106,600,000 | 97,800,000 | 161,400,000
Long-Lived Assets | 154,300,000 |  |  |  | 150,900,000 |  |  |  |  | 154,300,000 | 150,900,000 | 160,000,000.0
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  | 47,200,000 | 48,700,000 | 60,300,000
Corporate |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  | 100,000 | 100,000 | 100,000
Earnings from Equity Investments |  |  |  |  |  |  |  |  |  | 4,700,000 | 3,100,000 | (300,000)
Total Assets | 503,200,000 |  |  |  | 489,400,000 |  |  |  |  | 503,200,000 | 489,400,000 | 520,900,000
Equity Investments | 106,500,000 |  |  |  | 97,500,000 |  |  |  |  | 106,500,000 | 97,500,000 | 1,000,000.0
Long-Lived Assets | 6,500,000 |  |  |  | 200,000 |  |  |  |  | 6,500,000 | 200,000 | 100,000
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  | 0 | 100,000 | 100,000
Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible asset amortization expense |  |  |  |  |  |  |  |  |  | 27,200,000 | 29,800,000 | 35,100,000
Americas |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  |  | 3,792,400,000 | 4,278,600,000 | 4,258,900,000
Operating Unit Profit (Loss) |  |  |  |  |  |  |  |  |  | 116,000,000.0 | 203,400,000 | 224,900,000
Earnings from Equity Investments |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Americas | Reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  | 10,100,000 | 11,000,000.0 | 12,300,000
Total Assets | 2,485,100,000 |  |  |  | 2,536,200,000 |  |  |  |  | 2,485,100,000 | 2,536,200,000 | 2,232,100,000
Equity Investments | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
Long-Lived Assets | 24,000,000.0 |  |  |  | 28,700,000 |  |  |  |  | 24,000,000.0 | 28,700,000 | 28,700,000
Americas | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  | 9,500,000 | 12,700,000 | 10,600,000
Southern Europe |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  |  | 7,855,200,000 | 9,194,400,000 | 9,399,900,000
Operating Unit Profit (Loss) |  |  |  |  |  |  |  |  |  | 237,000,000.0 | 455,300,000 | 468,700,000
Earnings from Equity Investments |  |  |  |  |  |  |  |  |  | (100,000) | 47,400,000 | 1,500,000
Southern Europe | Reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  | 21,800,000 | 20,600,000 | 21,100,000
Total Assets | 4,167,200,000 |  |  |  | 3,975,500,000 |  |  |  |  | 4,167,200,000 | 3,975,500,000 | 3,730,900,000
Equity Investments | 100,000 |  |  |  | 300,000 |  |  |  |  | 100,000 | 300,000 | 158,100,000
Long-Lived Assets | 71,800,000 |  |  |  | 75,600,000 |  |  |  |  | 71,800,000 | 75,600,000 | 78,500,000
Southern Europe | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  | 16,300,000 | 20,000,000.0 | 26,200,000
Northern Europe |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  |  | 3,976,700,000 | 4,735,500,000 | 5,417,500,000
Operating Unit Profit (Loss) |  |  |  |  |  |  |  |  |  | (27,600,000) | 74,400,000 | 129,900,000
Earnings from Equity Investments |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Northern Europe | Reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  | (66,800,000) | (60,200,000) |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  | 8,900,000 | 9,800,000 | 11,400,000
Total Assets | 1,366,700,000 |  |  |  | 1,478,500,000 |  |  |  |  | 1,366,700,000 | 1,478,500,000 | 1,240,900,000
Equity Investments | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
Long-Lived Assets | 26,500,000 |  |  |  | 27,500,000 |  |  |  |  | 26,500,000 | 27,500,000 | 30,600,000
Northern Europe | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  | 7,300,000 | 7,700,000 | 16,600,000
APME |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  |  | 2,376,700,000 | 2,655,000,000.0 | 2,914,900,000
Operating Unit Profit (Loss) |  |  |  |  |  |  |  |  |  | 70,100,000 | 127,500,000 | 118,300,000
Earnings from Equity Investments |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
APME | Reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  | (3,800,000) |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  | 8,200,000 | 5,900,000 | 5,800,000
Total Assets | 806,000,000.0 |  |  |  | 744,200,000 |  |  |  |  | 806,000,000.0 | 744,200,000 | 795,000,000.0
Equity Investments | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 2,300,000
Long-Lived Assets | 25,500,000 |  |  |  | 18,900,000 |  |  |  |  | 25,500,000 | 18,900,000 | 22,100,000
APME | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  | 14,100,000 | 8,200,000 | 6,800,000
United States | Americas |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  |  | 2,327,200,000 | 2,590,600,000 | 2,608,900,000
Earnings from Equity Investments |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
United States | Americas | Reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  | 7,800,000 | 8,600,000 | 9,800,000
Total Assets | 2,103,800,000 |  |  |  | 2,153,800,000 |  |  |  |  | 2,103,800,000 | 2,153,800,000 | 1,888,100,000
Equity Investments | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
Long-Lived Assets | 16,500,000 |  |  |  | 20,500,000 |  |  |  |  | 16,500,000 | 20,500,000 | 22,400,000
United States | Americas | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  | 7,000,000.0 | 8,300,000 | 7,700,000
Other Americas | Americas |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  |  | 1,465,200,000 | 1,688,000,000.0 |
Earnings from Equity Investments |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other Americas | Americas | Reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  | 2,300,000 | 2,400,000 | 2,500,000
Total Assets | 381,300,000 |  |  |  | 382,400,000 |  |  |  |  | 381,300,000 | 382,400,000 | 344,000,000.0
Equity Investments | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
Long-Lived Assets | 7,500,000 |  |  |  | 8,200,000 |  |  |  |  | 7,500,000 | 8,200,000 | 6,300,000
Other Americas | Americas | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  | 2,500,000 | 4,400,000 | 2,900,000
France | Southern Europe |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  |  | 4,338,100,000 | 5,479,600,000 |
Earnings from Equity Investments |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
France | Southern Europe | Reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  | 14,400,000 | 13,900,000 | 14,200,000
Total Assets | 2,778,300,000 |  |  |  | 2,732,600,000 |  |  |  |  | 2,778,300,000 | 2,732,600,000 | 2,740,900,000
Equity Investments | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 0
Long-Lived Assets | 44,800,000 |  |  |  | 46,900,000 |  |  |  |  | 44,800,000 | 46,900,000 | 50,100,000
France | Southern Europe | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  | 9,300,000 | 12,900,000 | 18,100,000
Italy | Southern Europe |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  |  | 1,370,700,000 | 1,508,300,000 |
Earnings from Equity Investments |  |  |  |  |  |  |  |  |  | (100,000) | (100,000) | (200,000)
Italy | Southern Europe | Reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  | 2,100,000 | 1,800,000 | 1,900,000
Total Assets | 540,400,000 |  |  |  | 464,200,000 |  |  |  |  | 540,400,000 | 464,200,000 | 406,500,000
Equity Investments | 100,000 |  |  |  | 300,000 |  |  |  |  | 100,000 | 300,000 | 300,000
Long-Lived Assets | 6,000,000.0 |  |  |  | 5,200,000 |  |  |  |  | 6,000,000.0 | 5,200,000 | 5,000,000.0
Italy | Southern Europe | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  | 2,600,000 | 2,100,000 | 2,200,000
Other Southern Europe | Southern Europe |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  |  | 2,146,400,000 | 2,206,500,000 |
Earnings from Equity Investments |  |  |  |  |  |  |  |  |  | 0 | 47,500,000 | 1,700,000
Other Southern Europe | Southern Europe | Reportable segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and Amortization Expense |  |  |  |  |  |  |  |  |  | 5,300,000 | 4,900,000 | 5,000,000.0
Total Assets | 848,500,000 |  |  |  | 778,700,000 |  |  |  |  | 848,500,000 | 778,700,000 | 583,500,000
Equity Investments | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 157,800,000
Long-Lived Assets | $ 21,000,000.0 |  |  |  | $ 23,500,000 |  |  |  |  | 21,000,000.0 | 23,500,000 | 23,400,000
Other Southern Europe | Southern Europe | Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Additions to Long-Lived Assets |  |  |  |  |  |  |  |  |  | 4,400,000 | 5,000,000.0 | 5,900,000
Reportable subsegments | United States | Americas |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating Unit Profit (Loss) |  |  |  |  |  |  |  |  |  | 60,900,000 | 128,000,000.0 | 149,900,000
Reportable subsegments | Other Americas | Americas |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  |  | 1,465,200,000 | 1,688,000,000.0 | 1,650,000,000.0
Operating Unit Profit (Loss) |  |  |  |  |  |  |  |  |  | 55,100,000 | 75,400,000 | 75,000,000.0
Reportable subsegments | France | Southern Europe |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  |  | 4,338,100,000 | 5,479,600,000 | 5,846,400,000
Operating Unit Profit (Loss) |  |  |  |  |  |  |  |  |  | 149,000,000.0 | 284,900,000 | 290,900,000
Reportable subsegments | Italy | Southern Europe |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  |  | 1,370,700,000 | 1,508,300,000 | 1,673,900,000
Operating Unit Profit (Loss) |  |  |  |  |  |  |  |  |  | 64,200,000 | 102,500,000 | 111,300,000
Reportable subsegments | Other Southern Europe | Southern Europe |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues from Services |  |  |  |  |  |  |  |  |  | 2,146,400,000 | 2,206,500,000 | 1,879,600,000
Operating Unit Profit (Loss) |  |  |  |  |  |  |  |  |  | $ 23,800,000 | $ 67,900,000 | $ 66,500,000

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