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Segment Information - Reportable Segment Revenue, Income (Loss) Before Income Taxes, (Provision) Benefit for Income Taxes and Net Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 3,118.3 | $ 2,889.1 | $ 8,932.4 | $ 8,692.5
Income (loss) before income taxes | 49.0 | 44.4 | 164.4 | 165.7
Loss due to catastrophic events | 11.9 |  | 17.8 | 5.8
Asset impairments | 10.3 | 23.2 | 10.8 | 27.4
U.S. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 2,422.8 | 2,200.2 | 6,764.3 | 6,456.5
Income (loss) before income taxes | 54.6 | 43.4 | 164.8 | 152.9
Asset impairments | 3.3 | 23.2 | 3.3 | 27.4
U.K. |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 584.6 | 585.9 | 1,841.2 | 1,913.5
Income (loss) before income taxes | (7.4) | 2.7 | (2.7) | 14.4
Asset impairments | 7.0 |  | 7.0 |
Brazil |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 110.9 | 103.0 | 326.9 | 322.5
Income (loss) before income taxes | $ 1.8 | $ (1.7) | 2.3 | $ (1.6)
Asset impairments |  |  | $ 0.5 |

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