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Quarterly Financial Information (Unaudited) - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ 214.3 | $ 12.8 | $ (27.6) | $ (39.2) | $ (13.2) | $ 3.0 | $ (8.0) | $ (1.5) | $ 160.3 | $ (19.7) | $ 111.3
Impairment of intangible assets, finite-lived |  |  |  | $ 29.3 |  |  |  |  |  |  |  |
Senior Secured Second Priority Notes |  |  |  |  |  |  |  |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment on debt | $ 11.4 |  |  |  |  |  |  |  |  |  |  |
Senior Secured Second Priority Notes | 2022 Notes |  |  |  |  |  |  |  |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed | 122.0 | 123.5 |  |  | 122.0 |  |  |  |  | $ 123.5 |  |
Senior Secured Second Priority Notes | 2024 Notes |  |  |  |  |  |  |  |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal amount redeemed | $ 125.0 |  |  |  | 125.0 |  |  |  |  |  |  |
Loss on early extinguishment on debt |  | $ 5.6 |  |  | $ 5.8 |  |  |  |  |  |  |

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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629 + Details
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