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Financial Instruments - Change in Fair value (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 30, 2015 | Apr. 02, 2017 | Dec. 31, 2018 | Dec. 31, 2018 | Nov. 30, 2015
Apex |  |  |  |  |
Reconciliation of changes in fair value of all financial assets and liabilities |  |  |  |  |
Shares remaining to be acquired (as a percent) |  |  |  | 10.00% | 20.00%
Call option term | 3 years |  |  |  |
Outstanding shares acquired (as a percent) |  | 10.00% |  |  | 80.00%
Purchase price | $ 20.4 | $ 2.9 |  |  |
Aggregate ownership percentage |  |  |  | 90.00% |
Redeemable financial instrument |  |  |  |  |
Reconciliation of changes in fair value of all financial assets and liabilities |  |  |  |  |
Balance at the beginning of the period |  |  | $ 2.9 |  |
Total realized and unrealized (gains) losses included in Comprehensive income |  |  | (0.1) |  |
Balance at the ending of the period |  |  | 2.8 |  |
Liability recorded at acquisition date fair value |  |  | $ 2.9 | $ 2.8 |
Redeemable financial instrument | Apex |  |  |  |  |
Reconciliation of changes in fair value of all financial assets and liabilities |  |  |  |  |
Balance at the ending of the period | 5.5 |  |  |  |
Liability recorded at acquisition date fair value | $ 5.5 |  |  |  | $ 5.5

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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