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Summary of Significant Accounting Policies - Schedule of Changes in Restructuring Reserve (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |
Balance, beginning of period | $ 7.3 | $ 15.5
Severance costs | 74.2 | 32.4
Office closure costs | 27.3 | 9.6
Other costs | 9.2 |
Costs paid, utilized or transferred out | (71.9) | (50.2)
Balance at end of year | 46.1 | 7.3
Reportable segments | Americas |  |
Restructuring Cost and Reserve [Line Items] |  |
Balance, beginning of period | 0.4 | 0.5
Severance costs | 5.5 | 3.8
Office closure costs | 19.6 | 5.8
Other costs | 4.4 |
Costs paid, utilized or transferred out | (28.0) | (9.7)
Balance at end of year | 1.9 | 0.4
Reportable segments | Southern Europe |  |
Restructuring Cost and Reserve [Line Items] |  |
Balance, beginning of period | 0.7 | 1.9
Severance costs | 16.2 | 5.2
Office closure costs | 5.1 | 0.1
Other costs | 3.2 |
Costs paid, utilized or transferred out | (21.7) | (6.5)
Balance at end of year | 3.5 | 0.7
Reportable segments | Northern Europe |  |
Restructuring Cost and Reserve [Line Items] |  |
Balance, beginning of period | 6.2 | 13.1
Severance costs | 49.8 | 17.6
Office closure costs | 2.1 | 2.0
Other costs | 0.5 |
Costs paid, utilized or transferred out | (17.9) | (26.5)
Balance at end of year | 40.7 | 6.2
Reportable segments | APME |  |
Restructuring Cost and Reserve [Line Items] |  |
Balance, beginning of period | 0.0 | 0.0
Severance costs | 2.5 | 3.5
Office closure costs | 0.5 | 0.9
Other costs | 1.1 |
Costs paid, utilized or transferred out | (4.1) | (4.4)
Balance at end of year | 0.0 | 0.0
Corporate |  |
Restructuring Cost and Reserve [Line Items] |  |
Balance, beginning of period | 0.0 | 0.0
Severance costs | 0.2 | 2.3
Office closure costs | 0.0 | 0.8
Other costs | 0.0 |
Costs paid, utilized or transferred out | (0.2) | (3.1)
Balance at end of year | $ 0.0 | $ 0.0

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