Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Narrative (Details)

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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
(Accumulated deficit)   $ (186.3) $ (31.8)
Prepaid expenses and other current assets   18.0 27.5
Accounts receivable, net   $ (39.0) $ (52.6)
Minimum | Manufacturing equipment      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of property, plant, and equipment   3 years  
Minimum | Computer equipment      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of property, plant, and equipment   3 years  
Minimum | Office furniture and equipment      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of property, plant, and equipment   5 years  
Minimum | Tooling and engraving equipment      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of property, plant, and equipment   3 years  
Minimum | Heavy production equipment      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of property, plant, and equipment   10 years  
Minimum | Buildings      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of property, plant, and equipment   15 years  
Minimum | Computer software      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of property, plant, and equipment   3 years  
Maximum | Manufacturing equipment      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of property, plant, and equipment   15 years  
Maximum | Computer equipment      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of property, plant, and equipment   5 years  
Maximum | Office furniture and equipment      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of property, plant, and equipment   7 years  
Maximum | Tooling and engraving equipment      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of property, plant, and equipment   7 years  
Maximum | Heavy production equipment      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of property, plant, and equipment   15 years  
Maximum | Buildings      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of property, plant, and equipment   30 years  
Maximum | Computer software      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of property, plant, and equipment   7 years  
Contractual Rights      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of finite-lived intangible assets   5 years  
Contractual Rights | Minimum      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of finite-lived intangible assets   5 years  
Intellectual Property | Minimum      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of finite-lived intangible assets   2 years  
Intellectual Property | Maximum      
Property, Plant and Equipment [Line Items]      
Estimated useful lives of finite-lived intangible assets   15 years  
ASU 2016-02      
Property, Plant and Equipment [Line Items]      
Impact of adoption of ASU 2016-02, quantification   $ 10.0  
Impact of Adoption | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | ASU 2014-09      
Property, Plant and Equipment [Line Items]      
(Accumulated deficit) $ (4.1)    
Prepaid expenses and other current assets 0.4    
Accounts receivable, net 4.5    
ASU 2018-02      
Property, Plant and Equipment [Line Items]      
Tax Cuts And Jobs Act, reclassification from AOCI to Acumulated deficit $ (12.6)