Related Party Transactions (Details) - USD ($)		12 Months Ended
	Apr. 03, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]
Equity method investment, ownership interest		50.00%
Investment in unconsolidated affiliate		$ 181,900,000	$ 156,100,000
Equity in earnings of unconsolidated affiliates		27,800,000	31,800,000	$ 25,900,000
ART's assets, liabilities and results of operations:
Current assets		300,700,000	307,400,000
Noncurrent assets		237,800,000	160,200,000
Total assets		538,500,000	467,600,000
Current liabilities		177,100,000	158,300,000
Noncurrent liabilities		300,000	300,000
Total liabilities		177,400,000	158,600,000
Net sales		527,500,000	487,500,000	447,300,000
Costs and expenses applicable to net sales		453,400,000	410,600,000	379,800,000
Income before income taxes		59,000,000.0	65,500,000	53,600,000
Net income		56,500,000	64,200,000	52,100,000
Related party transactions:
Product manufactured for ART		260,800,000	229,100,000	213,800,000
Related Party Transaction, markup of product manufactured for ART reducing COGS		5,100,000	4,500,000	4,200,000
Charges for fixed costs, research and development and selling, general and administrative services to ART		51,100,000	41,800,000	$ 41,700,000
Schedule of Investments [Line Items]
Current asset, related party		173,900,000	0
Current liability, related party		173,900,000	0
Noncurrent liability		0	98,800,000
Equity Method Investee [Member]
Schedule of Investments [Line Items]
Accounts receivable		17,500,000	16,200,000
Current asset, related party		173,900,000	0
Noncurrent asset		0	98,800,000
Accounts payable		37,700,000	32,000,000.0
Debt payable within one year		9,900,000	9,800,000
Debt payable after one year		37,500,000	38,300,000
Current liability, related party		173,900,000	0
Noncurrent liability		$ 0	98,800,000
Debt Instrument, Frequency of Periodic Payment		monthly
Debt Instrument, Maturity Date Range, End		8 years
Debt Instrument, Basis Spread on Variable Rate	1.25%
Grace LOC to ART [Member]
Schedule of Investments [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 15,000,000.0
Commitment fee on credit facility		0.10%
Long-term Line of Credit		$ 0	0
Chevron LOC to ART [Member]
Schedule of Investments [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		$ 15,000,000.0
Commitment fee on credit facility		0.10%
Affiliated Entity [Member]
Schedule of Investments [Line Items]
Accounts receivable		$ 3,600,000	3,700,000
Revenue from Related Parties		$ 11,800,000	$ 14,000,000.0
Joint Venture [Member]
Schedule of Investments [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent		87.50%