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Restructuring - Summary of Restructuring Activities (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Reserve [Roll Forward] |  |  |  |
Accrual as of beginning of period |  | $ 157.7 | $ 108.7 | $ 98.0
Charges | $ 8.1 | 132.0 | 194.2 | 88.0
Utilization, Cash |  | (127.4) | (135.7) | (72.6)
Utilization, Non-cash |  | (23.3) | (9.5) | (4.7)
Accrual as of end of period | 139.0 | 139.0 | 157.7 | 108.7
Employee termination benefits |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Accrual as of beginning of period |  | 152.8 | 103.3 | 93.0
Charges |  | 104.2 | 167.8 | 74.5
Utilization, Cash |  | (122.2) | (118.3) | (64.2)
Utilization, Non-cash |  | 0.0 | 0.0 | 0.0
Accrual as of end of period | 134.8 | 134.8 | 152.8 | 103.3
Asset impairments |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Accrual as of beginning of period |  | 0.0 | 0.0 | 0.0
Charges |  | 23.3 | 9.5 | 4.7
Utilization, Cash |  | 0.0 | 0.0 | 0.0
Utilization, Non-cash |  | (23.3) | (9.5) | (4.7)
Accrual as of end of period | 0.0 | 0.0 | 0.0 | 0.0
Contract termination costs |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Accrual as of beginning of period |  | 4.9 | 5.4 | 5.0
Charges |  | 2.0 | 3.0 | 1.5
Utilization, Cash |  | (2.7) | (3.5) | (1.1)
Utilization, Non-cash |  | 0.0 | 0.0 | 0.0
Accrual as of end of period | 4.2 | 4.2 | 4.9 | 5.4
Other related costs |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Accrual as of beginning of period |  | 0.0 | 0.0 | 0.0
Charges |  | 2.5 | 13.9 | 7.3
Utilization, Cash |  | (2.5) | (13.9) | (7.3)
Utilization, Non-cash |  | 0.0 | 0.0 | 0.0
Accrual as of end of period | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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