Revenue from Contracts with Customers - Narrative (Details)	3 Months Ended
	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Inventories, net	$ 1,210,800,000			$ 1,176,100,000
Adjustment from current cost to LIFO cost basis	(23,100,000)			(43,100,000)
Sales	979,000,000	$ 865,900,000
Cost of sales	830,400,000	741,100,000
Short-term contract assets	38,600,000		$ 36,500,000	0
Long-term contract assets	16,100,000		16,900,000	0
Accrued liabilities	205,300,000			282,400,000
Other long-term liabilities	62,500,000			73,200,000
Short-term contract liabilities	66,200,000		69,700,000	0
Long-term contract liabilities	$ 19,700,000		22,200,000	0
Number of business segments | segment	2
Revenue, Performance Obligation [Abstract]
Confirmed order backlog	$ 2,050,000,000	$ 1,840,000,000
Confirmed orders with current performance obligations	0.77
Accounts receivable with customers	611,600,000			$ 550,900,000
Contract costs for obtaining and fulfilling contracts	5,400,000
Amortization of contract costs	300,000
ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Inventories, net	23,500,000		28,800,000
Short-term contract assets	4,200,000		3,700,000
Increase in accounts receivable	4,300,000		3,900,000
Accrued liabilities	(43,600,000)		(44,800,000)
Other long-term liabilities	(10,300,000)		(10,700,000)
Short-term contract liabilities	66,200,000		69,700,000
Long-term contract liabilities	19,700,000		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	50,500,000		49,700,000
Inventories, net	1,000,000		(34,200,000)
Adjustment from current cost to LIFO cost basis			$ 11,800,000
Sales	800,000
Cost of sales	(1,000,000)
Short-term contract assets	34,400,000
Long-term contract assets	$ 16,100,000