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Significant Accounting Policies - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) Segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Number of reportable segments | Segment |  | 2 |  |
Cost of sales |  | $ 807.4 | $ 677.3 | $ 524.5
Selling, engineering, general and administrative expenses |  | 159.1 | 144.3 | 119.5
Pension settlement charges | $ 6.1 | 0.0 | 6.1 | 0.0
Other expense (income), net |  | 0.6 | (0.8) | 1.8
Foreign currency transaction (gain) loss |  | 0.4 | (1.3) | 0.1
Depreciation expense |  | 28.4 | 25.2 | 18.9
Goodwill impairment |  | 0.0 | 0.0 | 0.0
Indefinite-lived intangible asset impairment |  | 0.0 | 0.0 | 0.0
Deferred revenue | $ 2.9 | 3.0 | 2.9 |
Pension settlement charges (operating expense) |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Pension settlement charges |  |  | 0.0 | 0.0
Selling, engineering, general and administrative expenses |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Research and development expenses |  | $ 13.0 | 13.0 | 13.4
Pension settlement charges (non-operating expense) |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Pension settlement charges |  |  | 6.1 | 0.0
Building | Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life |  | 8 years |  |
Building | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life |  | 40 years |  |
Machinery and Equipment | Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life |  | 3 years |  |
Machinery and Equipment | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life |  | 15 years |  |
Leasehold Improvements |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life description |  | over the shorter of the remaining life of the lease or the useful life of the improvement |  |
Rental Equipment | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Rental equipment operating lease term |  | 5 years |  |
As Reported |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cost of sales |  |  | 677.3 | 524.8
Selling, engineering, general and administrative expenses |  |  | 144.7 | 122.3
Other expense (income), net |  |  | (1.2) | (1.3)
As Reported | Pension settlement charges (operating expense) |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Pension settlement charges |  |  | 6.1 | 0.0
As Reported | Pension settlement charges (non-operating expense) |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Pension settlement charges |  |  | 0.0 | 0.0
Accounting Standards Update 2017-07 | Cost of sales |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impact of adoption |  |  | 0.0 | (0.3)
Accounting Standards Update 2017-07 | Pension settlement charges (operating expense) |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impact of adoption |  |  | (6.1) | 0.0
Accounting Standards Update 2017-07 | Selling, engineering, general and administrative expenses |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impact of adoption |  |  | (0.4) | (2.8)
Accounting Standards Update 2017-07 | Pension settlement charges (non-operating expense) |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impact of adoption |  |  | 6.1 | 0.0
Accounting Standards Update 2017-07 | Non-operating expense |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impact of adoption |  |  | $ 0.4 | $ 3.1

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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