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Revenue from Contracts with Customers - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
segment
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Jan. 01, 2018
USD ($)
Revenue recognition [Line Items]            
Inventories, net $ 1,217,500,000   $ 1,217,500,000   $ 1,211,100,000  
Adjustment from current cost to LIFO cost basis (13,900,000)   (13,900,000)   (2,900,000)  
Sales 1,080,400,000 $ 1,009,500,000 2,085,200,000 $ 1,988,500,000    
Cost of sales 902,700,000 835,800,000 1,776,400,000 1,666,200,000    
Short-term contract assets 40,900,000 47,700,000 40,900,000 47,700,000 51,200,000 $ 36,500,000
Long-term contract assets 100,000 100,000 100,000 100,000 100,000 16,900,000
Other current liabilities 257,800,000   257,800,000   260,100,000  
Other long-term liabilities 124,300,000   124,300,000   76,500,000  
Short-term contract liabilities 69,300,000 70,400,000 69,300,000 70,400,000 71,400,000 69,700,000
Long-term contract liabilities 7,300,000 14,600,000 $ 7,300,000 14,600,000 7,300,000 $ 22,200,000
Number of business segments | segment     2      
Revenue, Performance Obligation [Abstract]            
Confirmed order backlog 2,380,000,000 2,190,000,000 $ 2,380,000,000 2,190,000,000    
Confirmed orders with current performance obligations 0.80   0.80      
Accounts receivable with customers 586,400,000   586,400,000   533,800,000  
Contract costs for obtaining and fulfilling contracts 5,400,000   5,400,000   $ 5,200,000  
Amortization of contract costs $ 300,000 $ 300,000 $ 600,000 $ 600,000