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General - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Dec. 31, 2017
Jul. 01, 2018
Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Reclassification of income tax effects for ASU 2018-02 $ (47.6)   $ (47.6)     $ (47.6)  
Net sales 725.3 $ 662.2 2,153.4 $ 1,899.4      
Cost of sales (446.2) (408.6) (1,331.4) (1,186.8)      
Selling, general and administrative expenses (173.6) (164.1) (516.6) (485.5)      
Change in estimate     2.0        
Contract with customer, current liability 112.4   112.4       $ 110.3
Contract with customer, noncurrent liability 15.8   15.8       $ 15.5
Increase (decrease) in unbilled receivables     $ 45.6        
Increase (decrease) in unbilled receivables (percent)     38.40%        
Increase (decrease) in contract liability     $ 2.4        
Increase (decrease) in contract liability (percent)     1.90%        
Revenue recognized from contract liabilities 58.1            
Remaining performance obligation $ 1,706.6   $ 1,706.6        
Accounting Standards Update 2017-07              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cost of sales   2.8   8.5      
Selling, general and administrative expenses   $ 0.6   $ 1.6      
Sales Revenue, Net | Transferred at Point in Time              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Concentration of revenue (percent)     60.00%        
Sales Revenue, Net | Transferred over Time              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Concentration of revenue (percent)     40.00%        
Microwave Products              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Net sales         $ 24.2