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Restructuring Charges (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |  |
Severance and termination costs | $ 0.4 | $ 140.4 | $ 22.0
Lease Restructuring Cost | 6.3 | 256.0 | 11.9
Lease restructuring costs | 6.3 | 209.9 | 8.7
Other Restructuring Costs | 3.9 | 17.4 | 0.0
Restructuring Charges | 10.6 | 413.8 | $ 33.9
Restructuring Reserve | 9.4 | 74.6 |
IAN |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Lease restructuring costs | (0.7) | 190.4 |
Restructuring Charges | 3.0 | 317.9 |
DXTRA |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Lease restructuring costs | 7.1 | 59.8 |
Restructuring Charges | 9.7 | 78.8 |
Non-cash Items [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance and termination costs | 0.3 | 4.5 |
Lease Restructuring Cost |  | 256.0 |
Lease restructuring costs | 6.3 |  |
Other Restructuring Costs | 3.2 | 5.1 |
Restructuring Charges | 9.8 | 265.6 |
Cash Payments [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance and termination costs | 65.3 | 61.3 |
Lease Restructuring Cost |  | 0.0 |
Lease restructuring costs | 0.0 |  |
Other Restructuring Costs | 0.7 | 12.3 |
Restructuring Charges | 66.0 | 73.6 |
Other Restructuring [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 0.0 | 0.0 |
Lease impairment costs [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | 0.0 | 0.0 |
Employee Severance [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve | $ 9.4 | $ 74.6 |

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