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Revenue from Contracts with Customers - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
Jan. 01, 2018
USD ($)
Dec. 31, 2017
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Inventories, net $ 1,254,100,000   $ 1,254,100,000     $ 1,176,100,000
Adjustment from current cost to LIFO cost basis (3,700,000)   (3,700,000)     (43,100,000)
Sales 1,009,500,000 $ 880,200,000 1,988,500,000 $ 1,746,100,000    
Cost of sales 835,800,000 755,900,000 1,666,200,000 1,497,000,000    
Short-term contract assets 47,700,000   47,700,000   $ 36,500,000 0
Long-term contract assets 100,000   100,000   16,900,000  
Accrued liabilities 225,300,000   225,300,000     282,400,000
Other long-term liabilities 66,600,000   66,600,000     73,200,000
Short-term contract liabilities 70,400,000   70,400,000   69,700,000 0
Long-term contract liabilities 14,600,000   $ 14,600,000   22,200,000 0
Number of business segments | segment     2      
Revenue, Performance Obligation [Abstract]            
Confirmed order backlog 2,190,000,000 $ 1,800,000,000 $ 2,190,000,000 $ 1,800,000,000    
Confirmed orders with current performance obligations 0.83   0.83      
Accounts receivable with customers 628,000,000   628,000,000     $ 550,900,000
Contract costs for obtaining and fulfilling contracts 5,400,000   5,400,000      
Amortization of contract costs 300,000   600,000      
ASU 2014-09            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Inventories, net 18,100,000   18,100,000   28,800,000  
Adjustment from current cost to LIFO cost basis         11,800,000  
Short-term contract assets 2,500,000   2,500,000   3,700,000  
Increase in accounts receivable 4,400,000   4,400,000   3,900,000  
Accrued liabilities (50,300,000)   (50,300,000)   (44,800,000)  
Other long-term liabilities (9,800,000)   (9,800,000)   (10,700,000)  
Short-term contract liabilities 70,500,000   70,500,000   69,700,000  
Long-term contract liabilities 14,600,000   14,600,000   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 45,300,000   45,300,000   49,700,000  
Inventories, net 5,200,000   5,200,000   $ (34,200,000)  
Sales (5,100,000)   (4,300,000)      
Cost of sales (4,200,000)   (5,200,000)      
Short-term contract assets 45,200,000   45,200,000      
Long-term contract assets $ 100,000   $ 100,000