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Restructuring - Summary of Changes in Restructuring Accrual (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Restructuring Cost And Reserve [Line Items] |  |  |  |
Balance at December 31, 2019 |  |  | $ 5.7 |
Severance payments |  |  | (2.4) |
Accretion of interest | $ 0.1 | $ 0.1 | 0.3 | $ 0.3
Balance at June 30, 2020 | 3.6 |  | 3.6 |
2018 Restructuring Activities |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Balance at December 31, 2019 |  |  | 4.2 |
Severance payments |  |  | (1.0) |
Accretion of interest |  |  | 0.3 |
Balance at June 30, 2020 | 3.5 |  | 3.5 |
2019 Restructuring Activities |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Balance at December 31, 2019 |  |  | 1.5 |
Severance payments |  |  | (1.4) |
Balance at June 30, 2020 | $ 0.1 |  | $ 0.1 |

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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