Related Party Transactions (Details) - USD ($)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Investments in retail finance joint ventures	$ 4,500,000	$ 3,800,000	$ 3,900,000
Rabobank
Related Party Transaction [Line Items]
Ownership interest of controlling interest	51.00%
Finance joint ventures
Related Party Transaction [Line Items]
Investments in retail finance joint ventures	$ 2,800,000	0	0
TAFE
Related Party Transaction [Line Items]
Cost method investment, ownership percentage	23.75%
Beneficial ownership of related parties (in shares)	12,150,152
Beneficial ownership of related parties, maximum shares allowed per letter agreement (in shares)	12,170,290
Purchases from related party	$ 128,500,000	129,200,000	149,000,000
Revenue from related parties	1,100,000	2,200,000	2,100,000
Dividends from related parties	1,600,000	1,700,000	1,800,000
Praxair Inc
Related Party Transaction [Line Items]
Purchases from related party	2,000,000	600,000
PPG Industries, Inc.
Related Party Transaction [Line Items]
Purchases from related party	$ 3,100,000	$ 3,500,000	$ 3,800,000

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Beneficial Ownership of Related Parties, Shares

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Cost Method Investment, Ownership Percentage

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Dividends from Related Parties

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Ownership Interest of Controlling Interest

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Related Parties
-URI http://asc.fasb.org/extlink&oid=16382449

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999

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