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Restructuring (Narrative) (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($) | Jun. 30, 2020 employee | Mar. 31, 2020 USD ($) | Dec. 31, 2019 employee | Dec. 31, 2017 employee
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring gain, net | $ (13.1) |  | $ (1.2) |  |
2020 Repositioning Actions |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and related cost, expected number of positions eliminated | employee |  | 1,200 |  |  |
Restructuring and related cost, number of positions eliminated, period percent |  | 11.00% |  |  |
Restructuring gain, net | (0.5) |  | 0.0 |  |
2019 Repositioning Actions |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and related cost, expected number of positions eliminated | employee |  |  |  | 180 |
Restructuring and related cost, number of positions eliminated, period percent |  |  |  | 1.00% |
Restructuring gain, net | 0.1 |  | 0.0 |  |
2017 Repositioning Actions |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and related cost, expected number of positions eliminated | employee |  |  |  |  | 300
Restructuring and related cost, number of positions eliminated, period percent |  |  |  |  | 3.00%
Restructuring gain, net | $ (12.7) |  | $ (1.5) |  |

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- Definition The number of positions eliminated during the period as a percentage of total positions eliminated during the period in connection with the restructuring plan(s). + References No definition available. + Details
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