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Benefit Plans (Details) $ in Millions	9 Months Ended	12 Months Ended
	Dec. 31, 2016 USD ($) plan	Dec. 31, 2016 USD ($) plan	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Compensation and Retirement Disclosure [Abstract]
Number of defined-contribution 401(k) plans | plan	2	2
Percentage of employer match		100.00%
Percent of employees' gross pay matched		6.00%
Vesting schedule for employer's matching funds		3 years
Defined Contribution Plan Disclosure [Line Items]
Matching contributions made by the company		$ 8.1	$ 7.3	$ 6.6
Union Plan
Defined Contribution Plan Disclosure [Line Items]
Matching contributions made by the company	$ 0.1

X

- Definition

Represents the period over which the matching contributions vest under the defined contribution plan.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Represents the number of defined-contribution 401(k) plans.

+ References

No definition available.

+ Details

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Namespace Prefix:	cvi_
Data Type:	xbrli:integerItemType
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X

- References

No definition available.

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X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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- Details

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