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Revenue from Contracts with Customers - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
segment
Sep. 30, 2017
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Inventories, net $ 1,239,800,000   $ 1,239,800,000     $ 1,176,100,000
Adjustment from current cost to LIFO cost basis (1,700,000)   (1,700,000)     (43,100,000)
Sales 1,020,200,000 $ 869,100,000 3,008,700,000 $ 2,615,200,000    
Cost of sales 859,800,000 763,800,000 2,526,000,000 2,260,800,000    
Short-term contract assets 51,600,000   51,600,000   $ 36,500,000 0
Long-term contract assets 100,000   100,000   16,900,000  
Accrued liabilities 228,700,000   228,700,000     282,400,000
Other long-term liabilities 66,700,000   66,700,000     73,200,000
Short-term contract liabilities 69,200,000   69,200,000   69,700,000 0
Long-term contract liabilities 7,300,000   $ 7,300,000   22,200,000 0
Number of business segments | segment     2      
Revenue, Performance Obligation [Abstract]            
Confirmed order backlog 2,170,000,000 $ 1,810,000,000 $ 2,170,000,000 $ 1,810,000,000    
Confirmed orders with current performance obligations 0.82   0.82      
Accounts receivable with customers 594,500,000   594,500,000     $ 550,900,000
Contract costs for obtaining and fulfilling contracts 5,200,000   5,200,000      
Amortization of contract costs 300,000   900,000      
ASU 2014-09            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Inventories, net 14,200,000   14,200,000   28,800,000  
Adjustment from current cost to LIFO cost basis         11,800,000  
Short-term contract assets 4,600,000   4,600,000   3,700,000  
Increase in accounts receivable 3,700,000   3,700,000   3,900,000  
Accrued liabilities (46,700,000)   (46,700,000)   (44,800,000)  
Other long-term liabilities (7,300,000)   (7,300,000)   (10,700,000)  
Short-term contract liabilities 69,200,000   69,200,000   69,700,000  
Long-term contract liabilities 7,300,000   7,300,000   22,200,000  
ASU 2014-09 | Revenue Recognized Over-time            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Increase in retained earnings         15,500,000  
Contract assets 47,100,000   47,100,000   49,700,000  
Inventories, net 4,100,000   4,100,000   $ (34,200,000)  
Sales 1,800,000   (2,500,000)      
Cost of sales 1,100,000   (4,100,000)      
Short-term contract assets 47,000,000   47,000,000      
Long-term contract assets $ 100,000   $ 100,000