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Revenue Revenue - Textuals (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Maximum Percentage Of Revenue For Which Individual Customer Accounts For | 9.10% | 9.80% | 10.70%
Service and Repair Revenue, Percentage of Total | 4.00% |  |
Net Contract Liability, Change from Prior Year | $ 2.2 |  |
Net Contract Liability, Percentage Change from Prior Period | (5.60%) |  |
Contract with Customer, Liability, Revenue Recognized | $ 51.1 |  |
Revenue, Remaining Performance Obligation, Amount | 777.2 |  |
Capitalized Contract Cost, Net | 6.5 | $ 8.1 |
Capitalized Contract Cost, Amortization | 1.6 | $ 1.3 |
Minimum [Member] |  |  |
Revenue, Remaining Performance Obligation, Amount | 650.0 |  |
Maximum [Member] |  |  |
Revenue, Remaining Performance Obligation, Amount | $ 670.0 |  |

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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