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v3.19.3.a.u2

Subsequent event (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 741.5 | $ 757.6 | $ 753.8 | $ 695.8 | $ 760.9 | $ 688.3 | $ 667.4 | $ 708.4 |  | $ 2,948.7 | $ 2,825.0 | $ 2,741.8
Pretax income | $ (5.7) | $ 6.5 | $ 41.9 | $ (3.0) | $ 38.1 | $ 22.2 | $ 20.3 | $ 62.6 |  | 39.7 | $ 143.2 | $ (72.1)
U.S. Federal Business |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 725.0 |  |
Pretax income |  |  |  |  |  |  |  |  |  | $ 100.0 |  |
Subsequent Event | Forecast | Discontinued Operation, Disposed of by Sale | U.S. Federal Business |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash purchase price |  |  |  |  |  |  |  |  | $ 1,200.0 |  |  |
After-tax gain on sale of discontinued operation |  |  |  |  |  |  |  |  | $ 1,000.0 |  |  |

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