Long-Term Debt - Schedule of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Total debt	$ 1,196.9	$ 673.5
Unamortized debt issuance cost	(13.7)	(6.4)
Unamortized debt discount	(16.0)	0.0
Current portion of long-term debt and capital lease obligations	(1.7)	(126.4)
Long-term debt, net of current portion	1,165.5	540.7
Senior Notes \| 6.5% Senior Notes due 2022
Debt Instrument [Line Items]
Total debt	$ 500.0	$ 500.0
Stated interest rate (as a percent)	6.50%	6.50%
Senior Notes \| 9.25% Senior Notes due 2023
Debt Instrument [Line Items]
Total debt	$ 645.0	$ 0.0
Stated interest rate (as a percent)	9.25%
Notes Payable \| 6.5% Notes due 2021
Debt Instrument [Line Items]
Total debt	$ 4.2	0.0
Stated interest rate (as a percent)	6.50%
Line of Credit \| CRNF credit facility
Debt Instrument [Line Items]
Total debt	$ 0.0	125.0
Capital Lease Obligations
Debt Instrument [Line Items]
Total debt	$ 47.7	$ 48.5

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount, after accumulated amortization, of debt discount.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

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-Name Accounting Standards Codification
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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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