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Restructuring Expenses and Asset Impairments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring expenses and asset impairments |  |  |  | $ 9.3 | $ 11.8 | $ 21.0
Asset impairments |  |  |  | 0.8 | 3.1 | 10.2
Restructuring accrual | $ 3.9 | $ 6.1 |  | 2.8 | 3.9 | $ 6.1
Property, plant and equipment |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Asset impairment charges |  |  |  | $ 0.8 | $ 2.9 |
FMT |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Asset impairments | 2.5 |  |  |  |  |
FMT | Corporate Office |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Asset impairments | $ 0.6 |  |  |  |  |
HST |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Operating lease, impairment |  | $ 0.4 |  |  |  |
Asset impairment charges |  |  | $ 9.7 |  |  |

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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123351718&loc=d3e2420-110228 + 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://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/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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