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v3.7.0.1

Fair value measurements - Measured on a Recurring Basis (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Liabilities: |  |  |  |
Share-based compensation |  | $ 4.9 | $ 0.8 |
Fair Value, Measurements, Recurring |  |  |  |
Assets: |  |  |  |
Equity investments | $ 2.2 | 2.2 |  |
Liabilities: |  |  |  |
Deferred compensation arrangement | 1.5 | 1.5 |  | $ 0.7
Separation-related Reimbursement Awards | 0.9 | 0.9 |  | 2.1
Total liabilities | 2.4 | 2.4 |  | 2.8
Share-based compensation | 0.1 | 0.3 |  |
Fair Value, Measurements, Recurring | Level 1 |  |  |  |
Assets: |  |  |  |
Equity investments | 2.2 | 2.2 |  |
Liabilities: |  |  |  |
Deferred compensation arrangement | 1.5 | 1.5 |  | 0.7
Separation-related Reimbursement Awards | 0.9 | 0.9 |  | 2.1
Total liabilities | $ 2.4 | $ 2.4 |  | $ 2.8

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