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Segments - Schedule of Reconciliation of the Company's Segment Operating Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating income (loss) | $ 22.8 | $ 11.7 | $ (1.6) | $ 5.7 | $ 17.8 | $ 32.5 | $ 41.9 | $ 16.2 | $ 38.6 | $ 108.4 | $ (19.3)
Unallocated restructuring expense |  |  |  |  |  |  |  |  | 7.0 | 9.8 | 12.9
Segment Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating income (loss) |  |  |  |  |  |  |  |  | 74.5 | 139.8 | 22.1
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating income (loss) |  |  |  |  |  |  |  |  | (32.2) | (31.3) | (37.5)
Reconciliation of Company's Segment Operating Income |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total operating income (loss) |  |  |  |  |  |  |  |  | 38.6 | 108.4 | (19.3)
Unallocated restructuring expense |  |  |  |  |  |  |  |  | $ (3.7) | $ (0.1) | $ (3.9)

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