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Revenue from Contracts with Customers - Narrative (Details)
 3 Months Ended
Mar. 31, 2019
USD ($)
segment
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Jan. 01, 2018
USD ($)
Revenue recognition [Line Items]        
Inventories, net $ 1,254,400,000   $ 1,211,100,000  
Adjustment from current cost to LIFO cost basis (4,700,000)   (2,900,000)  
Sales 1,004,800,000 $ 979,000,000    
Cost of sales 873,700,000 830,400,000    
Short-term contract assets 48,700,000 38,600,000 51,200,000 $ 36,500,000
Long-term contract assets 100,000 16,100,000 100,000 16,900,000
Accrued liabilities 220,400,000   260,100,000  
Other long-term liabilities 123,100,000   76,500,000  
Short-term contract liabilities 77,900,000 66,200,000 71,400,000 69,700,000
Long-term contract liabilities $ 7,300,000 19,700,000 7,300,000 $ 22,200,000
Number of business segments | segment 2      
Revenue, Performance Obligation [Abstract]        
Confirmed order backlog $ 2,590,000,000 2,050,000,000    
Confirmed orders with current performance obligations 0.80      
Accounts receivable with customers 570,800,000   533,800,000  
Contract costs for obtaining and fulfilling contracts 5,200,000   $ 5,200,000  
Amortization of contract costs $ 300,000 $ 300,000