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The weighted average fair value at grant date for nonvested non-option equity-based awards issued during the period.

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Attainment Exceeds Target, Vesting, Percentage

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- Definition

Share-based compensation arrangement by share-based payment award, plan modification, number of non-option equity investments, affected

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

Number of shares under non-option equity instrument agreements that were either cancelled or expired.

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Net number of non-option equity instruments granted to participants.

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- Definition

Other increase (decrease) in number of shares reserved for issuance under non-option equity instrument agreements that is not separately disclosed.

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No definition available.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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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.

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Percentage of vesting of award under share-based payment arrangement.

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Number, after forfeiture, of shares or units issued under share-based payment arrangement. Excludes shares or units issued under employee stock ownership plan (ESOP).

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SHAREHOLDERS' EQUITY AND SHARE-BASED COMPENSATION - Restricted stock awards (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Share-based compensation expense	$ 11.9	$ 10.2	$ 4.3
Restricted Shares and Restricted Share Units
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Other than options, outstanding (in shares)	636,146	485,806
Other than options, granted (in shares)	401,458
Other than options, granted (in dollars per share)	$ 24.61
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	485,806
Granted (in shares)	401,458
Issued (in shares)	(138,504)
Forfeited/canceled (in shares)	(112,614)
Outstanding, end of period (in shares)	636,146	485,806
Restricted Shares and Restricted Share Units \| Vesting Based on Service
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Other than options, outstanding (in shares)	487,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding, end of period (in shares)	487,000
Restricted Shares and Restricted Share Units \| Performance-Based, Vesting Period One
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Award vesting rights, percentage	33.00%
Restricted Shares and Restricted Share Units \| Performance-Based, Vesting Period Two
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Award vesting rights, percentage	33.00%
Restricted Shares and Restricted Share Units \| Performance-Based, Vesting Period Three
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Award vesting rights, percentage	33.00%
Restricted Shares and Restricted Share Units \| Performance-Based
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Other than options, outstanding (in shares)	149,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding, end of period (in shares)	149,000
Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Other than options, plan modification, affected (in shares)		31,000
Minimum \| Restricted Shares and Restricted Share Units \| Vesting Based on Service
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Vesting period	2 years
Maximum \| Restricted Shares and Restricted Share Units \| Vesting Based on Service
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Vesting period	4 years
Maximum \| Restricted Shares and Restricted Share Units \| Performance-Based
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Attainment above threshold performance levels, vesting percentage	225.00%
Pointillist, Inc.
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Shares issued to management for services (in shares)	1,100,000
Share-based compensation expense	$ 0.9
Pointillist, Inc.
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Noncontrolling ownership percentage				12.10%