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Summary of Significant Accounting Policies (Details)
$ in Millions
3 Months Ended 12 Months Ended
Jul. 07, 2016
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
reporting_unit
Dec. 31, 2018
USD ($)
segments
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2015
USD ($)
Accounting Policies [Line Items]                  
Defined Benefit Plan, Other Cost (Credit)           $ 0.3 $ 0.2    
Proceeds from Divestiture of Businesses         $ 10.0 123.1 40.6    
Goodwill and Intangible Assets [Abstract]                  
Number of Reporting Units | reporting_unit       3          
Goodwill   $ 887.9   $ 884.9 887.9 884.9     $ 871.6
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)         0.0        
Property, Plant and Equipment [Abstract]                  
Total impairment charges         0.0 19.9 0.2    
Revenue Recognition [Abstract]                  
Accounts Receivable, Gross, Current   $ 128.6   127.0 128.6 127.0      
Revenue Recognition, Sales Discounts and Rebates         8.1 9.1 8.7    
Revenue Recognition, Sales Returns, Reserve for Sales Returns         $ 7.7 8.5 5.1    
Number of reportable segments | segments         2        
Document Fiscal Year Focus         2018        
Noncash Investing and Financing Items [Abstract]                  
Purchases of property and equipment included in accounts payable         $ 7.1 8.5 1.5    
Maximum                  
Accounting Policies [Line Items]                  
Operating Lease, Liability               $ 45.0  
Operating Lease, Right-of-Use Asset               42.0  
Goodwill and Intangible Assets [Abstract]                  
Finite-Lived Intangible Asset, Useful Life         15 years        
Minimum                  
Accounting Policies [Line Items]                  
Operating Lease, Liability               40.0  
Operating Lease, Right-of-Use Asset               $ 37.0  
Goodwill and Intangible Assets [Abstract]                  
Finite-Lived Intangible Asset, Useful Life         5 years        
Percentage of fair value in excess of carrying amount   50.00%     50.00%        
Buildings and improvements | Maximum                  
Property, Plant and Equipment [Abstract]                  
Property, plant and equipment, useful life         31 years 6 months        
Buildings and improvements | Minimum                  
Property, Plant and Equipment [Abstract]                  
Property, plant and equipment, useful life         5 years        
Machinery and equipment | Maximum                  
Property, Plant and Equipment [Abstract]                  
Property, plant and equipment, useful life         7 years        
Machinery and equipment | Minimum                  
Property, Plant and Equipment [Abstract]                  
Property, plant and equipment, useful life         1 year 6 months        
Furniture and fixtures | Maximum                  
Property, Plant and Equipment [Abstract]                  
Property, plant and equipment, useful life         5 years        
Furniture and fixtures | Minimum                  
Property, Plant and Equipment [Abstract]                  
Property, plant and equipment, useful life         2 years        
Vehicles                  
Property, Plant and Equipment [Abstract]                  
Property, plant and equipment, useful life         3 years        
Software and software development costs | Maximum                  
Property, Plant and Equipment [Abstract]                  
Property, plant and equipment, useful life         5 years        
Software and software development costs | Minimum                  
Property, Plant and Equipment [Abstract]                  
Property, plant and equipment, useful life         3 years        
Speaker and Receiver Product Line | Discontinued Operations, Disposed of by Sale [Member]                  
Accounting Policies [Line Items]                  
Proceeds from Divestiture of Businesses $ 40.6                
Patents                  
Goodwill and Intangible Assets [Abstract]                  
Finite-Lived Intangible Assets, Period Increase (Decrease)             0.0    
Patents | Maximum                  
Goodwill and Intangible Assets [Abstract]                  
Finite-Lived Intangible Asset, Useful Life         10 years        
Patents | Minimum                  
Goodwill and Intangible Assets [Abstract]                  
Finite-Lived Intangible Asset, Useful Life         7 years        
Impairment of Fixed and Other Assets                  
Property, Plant and Equipment [Abstract]                  
Total impairment charges             0.5    
Precision Devices                  
Goodwill and Intangible Assets [Abstract]                  
Goodwill   $ 28.0   25.0 $ 28.0 25.0     25.0
Precision Devices | Timing Device Business [Member] | Discontinued Operations, Disposed of by Sale [Member]                  
Accounting Policies [Line Items]                  
Proceeds from Divestiture of Businesses         135.1        
Audio                  
Goodwill and Intangible Assets [Abstract]                  
Goodwill   859.9   $ 859.9 859.9 859.9     $ 846.6
Property, Plant and Equipment [Abstract]                  
Total impairment charges         0.0 $ 21.3 $ 0.5    
Prepaid Expenses and Other Current Assets [Member] | Precision Devices | Timing Device Business [Member]                  
Accounting Policies [Line Items]                  
Proceeds from Divestiture of Businesses     $ 10.0            
Mobile Consumer Electronics [Member]                  
Goodwill and Intangible Assets [Abstract]                  
Goodwill   722.1     722.1        
Hearing Health Technologies [Member]                  
Goodwill and Intangible Assets [Abstract]                  
Goodwill   137.8     137.8        
Capacitors [Member]                  
Goodwill and Intangible Assets [Abstract]                  
Goodwill   28.0     $ 28.0        
Internal Revenue Service (IRS) [Member]                  
Accounting Policies [Line Items]                  
Increase (Decrease) in Income Taxes   17.8              
Unrecognized Tax Benefits, Period Increase (Decrease)   $ 36.0 $ 36.0