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Restructuring (Narrative) (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) | Sep. 30, 2020 employee | Jun. 30, 2020 USD ($) | Mar. 31, 2020 employee | Mar. 31, 2018 employee | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring (gains) charges, net | $ (0.2) |  | $ 23.2 |  |  | $ (13.3) | $ 22.0
2020 Repositioning Actions |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and related cost, expected number of positions eliminated | employee |  | 1,200 |  |  |  |  |
Restructuring and related cost, number of positions eliminated, period percent |  | 11.00% |  |  |  |  |
Restructuring (gains) charges, net | 0.0 |  | 24.2 |  |  | (0.5) | 24.2
2019 Repositioning Actions |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and related cost, expected number of positions eliminated | employee |  |  |  | 180 |  |  |
Restructuring and related cost, number of positions eliminated, period percent |  |  |  | 1.00% |  |  |
Restructuring (gains) charges, net |  |  |  |  |  | 0.1 | 0.0
2017 Repositioning Actions |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and related cost, expected number of positions eliminated | employee |  |  |  |  | 300 |  |
Restructuring and related cost, number of positions eliminated, period percent |  |  |  |  | 3.00% |  |
Restructuring (gains) charges, net | $ (0.2) |  | $ (1.0) |  |  | $ (12.9) | $ (2.5)

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- Definition The number of positions eliminated during the period as a percentage of total positions eliminated during the period in connection with the restructuring plan(s). + References No definition available. + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109237686&loc=d3e17752-110868 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 3: 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 4: 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)(1)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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