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Financial Instruments and Derivative Instruments - Change in Fair value (Details) - USD ($) $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 30, 2015 | Apr. 02, 2017 | Mar. 31, 2019 | Dec. 31, 2018
Apex |  |  |  |
Reconciliation of changes in fair value of all financial assets and liabilities |  |  |  |
Shares remaining to be acquired (as a percent) | 20.00% |  | 10.00% |
Call option term | 3 years |  |  |
Outstanding shares acquired (as a percent) | 80.00% | 10.00% |  |
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 |  |  |  |
Liability recorded at acquisition date fair value |  |  | $ 2.8 | $ 2.8
Redeemable financial instrument | Apex |  |  |  |
Reconciliation of changes in fair value of all financial assets and liabilities |  |  |  |
Liability recorded at acquisition date fair value | $ 5.5 |  |  |

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