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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Significant Accounting Policies [Line Items] |  |  |  |
Allowance for Doubtful Accounts | $ 3.1 | $ 2.4 | $ 1.3 | $ 1.3
Reserve for sale | 4.4 | 3.7 |  |
Interest on property plant and equipment,net | 0.5 | 0.8 |  |
Net of accumulated amortization | 78.7 | 70.4 |  |
Amortization of software cost | 3.8 | 16.2 | 18.5 |
Amortization expense for the deferred costs | 38.8 | 32.2 | 26.2 |
Research and Development Expense | 39.6 | 34.1 | 29.6 |
Advertising Expense | $ 5.5 | 5.4 | 5.8 |
Defined benefit plan expected long-term rate-of-return, description | The long-term rate of return is estimated by considering historical returns and expected returns on current and projected asset allocations and is generally applied to a five-year average market value of assets. |  |  |
ASU 2018-14 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 01, 2020 |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  |  |
ASU 2016-13 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 01, 2020 |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |  |
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] | true |  |  |
ASU 2016-02 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Jan. 01, 2019 |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] | true |  |  |
Defined Benefit Pension Plan [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Impact of change in discount rate of basis points | 0.25% |  |  |
Impact of change in discount rate defined benefit plan liability | $ 13.0 |  |  |
Defined benefit plan pre-tax earnings | $ 0.3 |  |  |
Change in the assumption for the long-term rate of return on plan assets basis points | 0.25% |  |  |
Change in the assumption for the long-term rate of return on plan assets before tax | $ 1.0 |  |  |
Other Assets [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Deferred costs | 132.9 | 106.4 |  |
Computer Software, Intangible Asset [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Amortization of software cost | $ 30.6 | $ 28.3 | $ 26.2 |
Computer Software, Intangible Asset [Member] | Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible asset, useful life | 2 years |  |  |
Computer Software, Intangible Asset [Member] | Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible asset, useful life | 7 years |  |  |

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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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