Revenue from Contracts with Customers - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) segment	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2018 USD ($)
Revenue recognition [Line Items]
Inventories, net	$ 1,168,500,000		$ 1,168,500,000		$ 1,211,100,000
Adjustment from current cost to LIFO cost basis	(6,700,000)		(6,700,000)		(2,900,000)
Sales	1,018,700,000	$ 1,020,200,000	3,103,900,000	$ 3,008,700,000
Cost of sales	859,000,000.0	859,800,000	2,635,400,000	2,526,000,000.0
Short-term contract assets	37,800,000	51,600,000	37,800,000	51,600,000	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	238,300,000		238,300,000		260,100,000
Other long-term liabilities	124,900,000		124,900,000		76,500,000
Short-term contract liabilities	97,100,000	69,200,000	97,100,000	69,200,000	71,400,000	69,700,000
Long-term contract liabilities	7,300,000	7,300,000	$ 7,300,000	7,300,000	7,300,000	$ 22,200,000
Number of business segments | segment			2
Revenue, Performance Obligation [Abstract]
Confirmed order backlog	2,340,000,000	2,170,000,000	$ 2,340,000,000	2,170,000,000
Confirmed orders with current performance obligations	0.75		0.75
Accounts receivable with customers	601,700,000		601,700,000		533,800,000
Contract costs for obtaining and fulfilling contracts	5,100,000		5,100,000		$ 5,200,000
Amortization of contract costs	$ 400,000	$ 300,000	$ 1,000,000.0	$ 900,000