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Segment Information - Summary of Financial Information Concerning Reportable Segments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | $ 270,400 |  |  | $ 293,500 |  | $ 830,000 | $ 888,200 |
Interest, investment and other income, including realized gains and losses | 94,300 |  |  | 12,900 |  | 182,800 | 82,300 |
Total revenues and other income | 364,700 |  |  | 306,400 |  | 1,012,800 | 970,500 |
Depreciation and amortization | 12,900 |  |  | 16,100 |  | 40,100 | 45,300 |
Interest expense | (5,200) |  |  | (400) |  | (14,400) | (3,600) |
(Loss) earnings before income taxes and equity in earnings (losses) of unconsolidated affiliates | 65,500 |  |  | (12,800) |  | 105,700 | (22,700) |
Income tax (benefit) expense | 15,600 | $ 5,900 | $ (7,200) | (900) | $ (1,300) | 14,300 | (3,800) |
Earnings (loss) before equity in losses of unconsolidated affiliates | 49,900 |  |  | (11,900) |  | 91,400 | (18,900) |
Equity in earnings (losses) of unconsolidated affiliates | (8,300) | (21,100) | (21,400) | 3,800 | (42,500) | (50,800) | (16,900) |
Net earnings (loss) | 41,600 | $ 18,900 | $ (19,900) | (8,100) | $ (1,000) | 40,600 | (35,800) |
Assets | 1,893,700 |  |  | 1,364,700 |  | 1,893,700 | 1,364,700 | $ 1,459,500
Goodwill | 164,800 |  |  | 197,200 |  | 164,800 | 197,200 | $ 164,800
Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |
Ceridian and Dun & Bradstreet Elimination |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | (610,500) |  |  | (178,100) |  | (1,583,500) | (545,900) |
Interest, investment and other income, including realized gains and losses | (6,700) |  |  | 0 |  | (20,700) | 0 |
Total revenues and other income | (617,200) |  |  | (178,100) |  | (1,604,200) | (545,900) |
Depreciation and amortization | (138,300) |  |  | (14,300) |  | (384,500) | (42,400) |
Interest expense | 93,400 |  |  | 8,800 |  | 245,800 | 74,400 |
(Loss) earnings before income taxes and equity in earnings (losses) of unconsolidated affiliates | 82,200 |  |  | (6,500) |  | 254,400 | 37,900 |
Income tax (benefit) expense | 89,400 |  |  | 700 |  | 134,700 | (6,300) |
Earnings (loss) before equity in losses of unconsolidated affiliates | (7,200) |  |  | (7,200) |  | 119,700 | 44,200 |
Equity in earnings (losses) of unconsolidated affiliates | (9,300) |  |  | 1,200 |  | (55,300) | (20,400) |
Net earnings (loss) | (16,500) |  |  | (6,000) |  | 64,400 | 23,800 |
Assets | (14,511,900) |  |  | (6,057,400) |  | (14,511,900) | (6,057,400) |
Goodwill | (4,928,600) |  |  | (1,949,800) |  | (4,928,600) | (1,949,800) |
Restaurant revenue |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 247,700 |  |  | 269,300 |  | 772,000 | 819,300 |
Restaurant revenue | Ceridian and Dun & Bradstreet Elimination |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 0 |  |  | 0 |  | 0 | 0 |
Other operating revenue |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 22,700 |  |  | 24,200 |  | 58,000 | 68,900 |
Other operating revenue | Ceridian and Dun & Bradstreet Elimination |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | (610,500) |  |  | (178,100) |  | (1,583,500) | (545,900) |
Restaurant Group |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 247,700 |  |  | 269,300 |  | 772,000 | 819,300 |
Restaurant Group | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 247,700 |  |  | 269,300 |  | 772,000 | 819,300 |
Interest, investment and other income, including realized gains and losses | 1,100 |  |  | (2,400) |  | 4,600 | (1,000) |
Total revenues and other income | 248,800 |  |  | 266,900 |  | 776,600 | 818,300 |
Depreciation and amortization | 9,000 |  |  | 11,800 |  | 28,100 | 33,200 |
Interest expense | (1,500) |  |  | (4,100) |  | (4,000) | (11,600) |
(Loss) earnings before income taxes and equity in earnings (losses) of unconsolidated affiliates | (13,200) |  |  | (21,700) |  | (32,900) | (36,900) |
Income tax (benefit) expense | 0 |  |  | 0 |  | (100) | 0 |
Earnings (loss) before equity in losses of unconsolidated affiliates | (13,200) |  |  | (21,700) |  | (32,800) | (36,900) |
Equity in earnings (losses) of unconsolidated affiliates | 0 |  |  | 0 |  | 0 | 100 |
Net earnings (loss) | (13,200) |  |  | (21,700) |  | (32,800) | (36,800) |
Assets | 610,100 |  |  | 454,800 |  | 610,100 | 454,800 |
Goodwill | 76,500 |  |  | 103,100 |  | 76,500 | 103,100 |
Restaurant Group | Restaurant revenue |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 228,900 |  |  | 247,600 |  | 721,900 | 765,100 |
Restaurant Group | Restaurant revenue | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 247,700 |  |  | 269,300 |  | 772,000 | 819,300 |
Restaurant Group | Other operating revenue | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 0 |  |  | 0 |  | 0 | 0 |
T-System | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 13,400 |  |  | 14,100 |  | 38,500 | 44,300 |
Interest, investment and other income, including realized gains and losses | 7,900 |  |  | 0 |  | 7,400 | 0 |
Total revenues and other income | 21,300 |  |  | 14,100 |  | 45,900 | 44,300 |
Depreciation and amortization | 3,400 |  |  | 3,900 |  | 10,300 | 11,200 |
Interest expense | (1,400) |  |  | (1,400) |  | (4,200) | (2,900) |
(Loss) earnings before income taxes and equity in earnings (losses) of unconsolidated affiliates | 4,400 |  |  | (2,300) |  | (5,500) | (5,700) |
Income tax (benefit) expense | 600 |  |  | (500) |  | (1,800) | (2,800) |
Earnings (loss) before equity in losses of unconsolidated affiliates | 3,800 |  |  | (1,800) |  | (3,700) | (2,900) |
Equity in earnings (losses) of unconsolidated affiliates | 0 |  |  | 0 |  | 0 | 0 |
Net earnings (loss) | 3,800 |  |  | (1,800) |  | (3,700) | (2,900) |
Assets | 198,400 |  |  | 219,500 |  | 198,400 | 219,500 |
Goodwill | 88,300 |  |  | 94,000 |  | 88,300 | 94,000 |
T-System | Restaurant revenue | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 0 |  |  | 0 |  | 0 | 0 |
T-System | Other operating revenue | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 13,400 |  |  | 14,100 |  | 38,500 | 44,300 |
Ceridian | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 202,300 |  |  | 178,100 |  | 602,300 | 545,900 |
Interest, investment and other income, including realized gains and losses | 0 |  |  | 0 |  | 0 | 0 |
Total revenues and other income | 202,300 |  |  | 178,100 |  | 602,300 | 545,900 |
Depreciation and amortization | 14,900 |  |  | 14,300 |  | 43,900 | 42,400 |
Interest expense | (7,800) |  |  | (8,800) |  | (25,200) | (74,400) |
(Loss) earnings before income taxes and equity in earnings (losses) of unconsolidated affiliates | (2,900) |  |  | 6,500 |  | 22,700 | (37,900) |
Income tax (benefit) expense | (65,600) |  |  | (700) |  | (57,500) | 6,300 |
Earnings (loss) before equity in losses of unconsolidated affiliates | 62,700 |  |  | 7,200 |  | 80,200 | (44,200) |
Equity in earnings (losses) of unconsolidated affiliates | 0 |  |  | 0 |  | 0 | 0 |
Net earnings (loss) | 62,700 |  |  | 7,200 |  | 80,200 | (44,200) |
Assets | 5,436,200 |  |  | 6,057,400 |  | 5,436,200 | 6,057,400 |
Goodwill | 1,961,200 |  |  | 1,949,800 |  | 1,961,200 | 1,949,800 |
Ceridian | Restaurant revenue | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 0 |  |  | 0 |  | 0 | 0 |
Ceridian | Other operating revenue | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 202,300 |  |  | 178,100 |  | 602,300 | 545,900 |
Dun And Bradstreet | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 408,200 |  |  |  |  | 981,200 |  |
Interest, investment and other income, including realized gains and losses | 6,700 |  |  |  |  | 20,700 |  |
Total revenues and other income | 414,900 |  |  |  |  | 1,001,900 |  |
Depreciation and amortization | 123,400 |  |  |  |  | 340,600 |  |
Interest expense | (85,600) |  |  |  |  | (220,600) |  |
(Loss) earnings before income taxes and equity in earnings (losses) of unconsolidated affiliates | (79,300) |  |  |  |  | (277,100) |  |
Income tax (benefit) expense | (23,800) |  |  |  |  | (77,200) |  |
Earnings (loss) before equity in losses of unconsolidated affiliates | (55,500) |  |  |  |  | (199,900) |  |
Equity in earnings (losses) of unconsolidated affiliates | 600 |  |  |  |  | 3,400 |  |
Net earnings (loss) | (54,900) |  |  |  |  | (196,500) |  |
Assets | 9,075,700 |  |  |  |  | 9,075,700 |  |
Goodwill | 2,967,400 |  |  |  |  | 2,967,400 |  |
Dun And Bradstreet | Restaurant revenue | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 0 |  |  |  |  | 0 |  |
Dun And Bradstreet | Other operating revenue | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 408,200 |  |  |  |  | 981,200 |  |
Corporate and Other | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 9,300 |  |  | 10,100 |  | 19,500 | 24,600 |
Interest, investment and other income, including realized gains and losses | 85,300 |  |  | 15,300 |  | 170,800 | 83,300 |
Total revenues and other income | 94,600 |  |  | 25,400 |  | 190,300 | 107,900 |
Depreciation and amortization | 500 |  |  | 400 |  | 1,700 | 900 |
Interest expense | (2,300) |  |  | 5,100 |  | (6,200) | 10,900 |
(Loss) earnings before income taxes and equity in earnings (losses) of unconsolidated affiliates | 74,300 |  |  | 11,200 |  | 144,100 | 19,900 |
Income tax (benefit) expense | 15,000 |  |  | (400) |  | 16,200 | (1,000) |
Earnings (loss) before equity in losses of unconsolidated affiliates | 59,300 |  |  | 11,600 |  | 127,900 | 20,900 |
Equity in earnings (losses) of unconsolidated affiliates | 400 |  |  | 2,600 |  | 1,100 | 3,400 |
Net earnings (loss) | 59,700 |  |  | 14,200 |  | 129,000 | 24,300 |
Assets | 1,085,200 |  |  | 690,400 |  | 1,085,200 | 690,400 |
Goodwill | 0 |  |  | 100 |  | 0 | 100 |
Corporate and Other | Restaurant revenue | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | 0 |  |  | 0 |  | 0 | 0 |
Corporate and Other | Other operating revenue | Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Revenues from external customers | $ 9,300 |  |  | $ 10,100 |  | $ 19,500 | $ 24,600 |

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