Debt - Loss on Extinguishment of Debt (Details) - USD ($) $ in Millions		12 Months Ended
May 10, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Loss on extinguishment of debt before write-off of deferred financing costs		$ 7.6
Write-off of deferred financing costs		$ 4.2
Senior Unsecured Notes \| 5.875% Senior Notes due 2021
Debt Instrument [Line Items]
Interest rate (percent)	5.875%	5.875%
Redemption price of notes (percent)	102.938%	102.938%

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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.

+ References

No definition available.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 470
-Section 50
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- Definition

Reflects the difference between the fair value of payments made to legally extinguish a debt and its carrying value at that time. This item excludes the write-off of amounts previously capitalized as debt issuance costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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