Revenue from Contracts with Customers - Narrative (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounting Standards Update [Extensible List]											us-gaap:AccountingStandardsUpdate201409Member
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected [Extensible List]											us-gaap:AccountingStandardsUpdate201409RetrospectiveMember
Change in shareholders' equity from ASU 2020-06 adoption	$ 641,400,000				$ 2,193,200,000				$ 641,400,000	$ 2,193,200,000	$ 1,991,600,000	$ 1,844,500,000
Inventories, net	997,100,000				1,155,300,000				997,100,000	1,155,300,000
Adjustment from current cost to LIFO cost basis	(44,100,000)				(33,600,000)				(44,100,000)	(33,600,000)
Sales	658,300,000	$ 598,000,000.0	$ 770,300,000	$ 955,500,000	1,018,600,000	$ 1,018,700,000	$ 1,080,400,000	$ 1,004,800,000	2,982,100,000	4,122,500,000	4,046,600,000
Cost of sales									2,689,300,000	3,484,700,000	3,416,300,000
Short-term contract assets	38,900,000				38,500,000				38,900,000	38,500,000	51,200,000	36,500,000
Long-term contract assets	0				100,000				0	100,000	100,000	16,900,000
Other long-term liabilities	189,900,000				160,800,000				189,900,000	160,800,000
Short-term contract liabilities	111,800,000				78,700,000				111,800,000	78,700,000	71,400,000	69,700,000
Long-term contract liabilities	32,000,000.0				25,900,000				$ 32,000,000.0	25,900,000	7,300,000	22,200,000
Number of business segments | segment									2
Revenue, Performance Obligation [Abstract]
Confirmed order backlog	1,400,000,000				2,300,000,000				$ 1,400,000,000	2,300,000,000	2,200,000,000
Confirmed orders with current performance obligations	0.75								0.75
Accounts receivable with customers	350,100,000				558,700,000				350,100,000	558,700,000
Contract costs for obtaining and fulfilling contracts	$ 5,400,000				$ 6,500,000				5,400,000	6,500,000
Amortization of contract costs									$ 1,400,000	$ 1,400,000	$ 1,200,000
Cumulative effect of adoption of new accounting standard
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Change in shareholders' equity from ASU 2020-06 adoption												$ 15,500,000