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Fair Value Measurements - Available-for-sale Securities (Details) - USD ($) $ in Millions | Oct. 01, 2021 | Dec. 31, 2020
--- | --- | ---
Other Assets | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment maturity | 1 year |
Other Assets | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment maturity | 5 years |
Demand and time deposits | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | $ 8.1 | $ 8.5
Unrealized gains | 0.0 | 0.0
Unrealized losses | 0.0 | 0.0
Fair value | 8.1 | 8.5
Money market funds | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 2.3 |
Unrealized gains | 0.0 |
Unrealized losses | 0.0 |
Fair value | 2.3 |
Corporate bonds | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 2.5 |
Unrealized gains | 0.0 |
Unrealized losses | 0.0 |
Fair value | 2.5 |
Corporate bonds | Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 12.7 |
Unrealized gains | 0.0 |
Unrealized losses | 0.0 |
Fair value | 12.7 |
Corporate bonds | Other Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 19.0 |
Unrealized gains | 0.0 |
Unrealized losses | 0.0 |
Fair value | 19.0 |
Certificate of deposit | Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 2.0 |
Unrealized gains | 0.0 |
Unrealized losses | 0.0 |
Fair value | 2.0 |
Certificate of deposit | Other Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 0.5 |
Unrealized gains | 0.0 |
Unrealized losses | 0.0 |
Fair value | 0.5 |
Commercial paper | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 4.0 |
Unrealized gains | 0.0 |
Unrealized losses | 0.0 |
Fair value | 4.0 |
Commercial paper | Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 4.9 |
Unrealized gains | 0.0 |
Unrealized losses | 0.0 |
Fair value | 4.9 |
US Treasury bonds | Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 0.4 |
Unrealized gains | 0.0 |
Unrealized losses | 0.0 |
Fair value | 0.4 |
US Treasury bonds | Other Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 1.5 |
Unrealized gains | 0.0 |
Unrealized losses | 0.0 |
Fair value | 1.5 |
Level 1 | Demand and time deposits | Fair Value, Measurements, Recurring | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 8.1 | 8.5
Level 1 | Money market funds | Fair Value, Measurements, Recurring | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 2.3 |
Level 1 | Corporate bonds | Fair Value, Measurements, Recurring | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 0.0 |
Level 1 | Corporate bonds | Fair Value, Measurements, Recurring | Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 0.0 |
Level 1 | Corporate bonds | Fair Value, Measurements, Recurring | Other Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 0.0 |
Level 1 | Certificate of deposit | Fair Value, Measurements, Recurring | Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 0.0 |
Level 1 | Certificate of deposit | Fair Value, Measurements, Recurring | Other Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 0.0 |
Level 1 | Commercial paper | Fair Value, Measurements, Recurring | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 0.0 |
Level 1 | Commercial paper | Fair Value, Measurements, Recurring | Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 2.9 |
Level 1 | US Treasury bonds | Fair Value, Measurements, Recurring | Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 0.0 |
Level 1 | US Treasury bonds | Fair Value, Measurements, Recurring | Other Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 0.0 |
Level 2 | Demand and time deposits | Fair Value, Measurements, Recurring | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 0.0 | $ 0.0
Level 2 | Money market funds | Fair Value, Measurements, Recurring | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 0.0 |
Level 2 | Corporate bonds | Fair Value, Measurements, Recurring | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 2.5 |
Level 2 | Corporate bonds | Fair Value, Measurements, Recurring | Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 12.7 |
Level 2 | Corporate bonds | Fair Value, Measurements, Recurring | Other Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 19.0 |
Level 2 | Certificate of deposit | Fair Value, Measurements, Recurring | Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 2.0 |
Level 2 | Certificate of deposit | Fair Value, Measurements, Recurring | Other Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 0.5 |
Level 2 | Commercial paper | Fair Value, Measurements, Recurring | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 4.0 |
Level 2 | Commercial paper | Fair Value, Measurements, Recurring | Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 2.0 |
Level 2 | US Treasury bonds | Fair Value, Measurements, Recurring | Other Current Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | 0.4 |
Level 2 | US Treasury bonds | Fair Value, Measurements, Recurring | Other Assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value | $ 1.5 |

X
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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