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Financial Instruments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Other long-term assets | $ 11.2 | $ 15.2 | $ 11.2 | $ 15.2 |
Impairment loss | 4.0 | 5.0 | 4.0 | 5.0 |
Interest expense |  |  | 99.6 | 92.0 | $ 84.1
Tax benefits (expense) related to derivative instruments and hedging activities recognized in other comprehensive income (loss) |  |  | (0.8) | (5.5) | (3.3)
Derivative contracts transfers in to Level 3 fair value hierarchy |  |  | 0.0 | 0.0 |
Lear Fawsn |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Noncontrolling interests, fair value |  |  |  |  | 14.0
Fair value of previously held equity interest in acquiree |  |  |  |  | 23.0
Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Derivative contracts classified within Level 3 of fair value hierarchy | 0.0 | 0.0 | 0.0 | 0.0 |
Level 3 | Lear Fawsn |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Intangible assets |  |  |  |  | 7.5
Property, plant and equipment, fair value |  |  |  |  | 11.0
Noncontrolling interests, fair value |  |  |  |  | $ 14.0
Designated as Hedging Instrument | Foreign currency contracts, net | Derivative instruments and hedging |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Pretax net losses related to derivative instruments and hedging activities in accumulated other comprehensive loss | $ 4.7 | 19.4 | 4.7 | 19.4 |
Net investment hedges | Designated as Hedging Instrument | Interest rate swap |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Interest expense |  |  | $ 6.5 | 1.8 |
Estimate of Fair Value Measurement | Level 3 | Xevo Inc. |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Intangible assets |  | $ 90.1 |  | $ 90.1 |

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- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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- Definition Amount of transfers of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset) into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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