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Quarterly Financial Data (unaudited) - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Oct. 03, 2020 | Jul. 04, 2020 | Apr. 04, 2020 | Dec. 31, 2019 | Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tax expense (benefit) on valuation allowances on the deferred tax assets of a certain foreign subsidiary |  | $ 9.8 | $ 22.8 |  | $ 14.1 |  |  |  | $ 47.7 | $ 1.2 | $ (38.8)
Loss on extinguishment of debt |  |  |  | $ 21.1 |  |  | $ 10.6 |  | 21.1 | 10.6 | 0.0
Tax benefit on restructuring charges and various other items |  | 10.2 | $ 21.1 |  | 32.2 | $ 9.1 | 11.0 | $ 15.6 |  |  |
Deferred tax asset | $ 16.7 |  |  |  |  |  |  |  | 52.9 |  |
Defined benefit plan, loss due to settlement | 2.7 | 10.2 |  |  |  |  |  |  | 12.9 |  |
Deferred (benefit) provision | 15.5 |  |  |  |  |  |  |  | 21.5 | 14.4 | (4.8)
Impairment loss | 4.0 |  |  |  | 5.0 |  |  |  | 4.0 | 5.0 |
Tax benefit on share-based compensation |  |  |  |  |  |  |  | 3.2 |  |  |
Research and development and other tax credits |  |  |  |  |  | 28.6 |  |  |  |  |
Gain from deconsolidation |  |  |  |  |  | $ 4.0 |  |  |  | 4.0 |
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount |  | $ 5.0 |  |  |  |  |  |  | 11.8 | 40.8 | 9.9
Charges | $ 8.1 |  |  |  |  |  |  |  | $ 132.0 | $ 194.2 | $ 88.0
Gain (Loss) On Extinguishment of Debt, Restructuring Charges, And Other Items |  |  |  | $ 10.6 |  |  |  |  |  |  |
Foreign Tax Authority |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Tax expense (benefit) on valuation allowances on the deferred tax assets of a certain foreign subsidiary |  |  |  |  |  |  | $ 10.4 | $ 18.4 |  |  |
Foreign |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Curtailment gain |  |  |  |  | $ 12.9 |  |  |  |  |  |

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