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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Attainment Exceeds Target, Vesting, Percentage

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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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- 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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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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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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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, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Share-based compensation expense	$ 7.8	$ 11.9	$ 10.2
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)	878,521	636,146		636,146
Other than options, granted (in shares)	608,695
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	636,146
Granted (in shares)	608,695
Issued (in shares)	(210,556)
Forfeited/canceled (in shares)	(155,764)
Outstanding, end of period (in shares)	878,521	636,146
Restricted Shares and Restricted Stock Units (RSUs), Service-Based
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Other than options, outstanding (in shares)	403,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding, end of period (in shares)	403,000
Restricted Shares and Restricted Stock Units (RSUs), Performance-Based
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Other than options, outstanding (in shares)	213,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding, end of period (in shares)	213,000
Restricted Shares and Restricted Stock Units (RSUs), Performance-Based \| Share-based Payment Arrangement, Tranche 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 Stock Units (RSUs), Performance-Based \| Share-based Payment Arrangement, Tranche 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 Stock Units (RSUs), Performance-Based \| Share-based Payment Arrangement, Tranche 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 Stock Units (RSUs), Market-Based
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Other than options, outstanding (in shares)	194,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding, end of period (in shares)	194,000
Restricted Shares and Restricted Stock Units (RSUs), Performance-Based and Market-Based
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Other than options, outstanding (in shares)	69,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding, end of period (in shares)	69,000
Restricted Share Units
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Other than options, granted (in shares)	609,000
Other than options, granted (in dollars per share)	$ 13.47
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Granted (in shares)	609,000
Restricted Stock Units (RSUs), Performance-Based
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Other than options, granted (in shares)	82,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Granted (in shares)	82,000
Restricted Stock Units (RSUs), Market-Based
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Other than options, granted (in shares)	194,000	68,000	0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Granted (in shares)	194,000	68,000	0
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
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%
Minimum \| Restricted Shares and Restricted Stock Units (RSUs), Service-Based
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Vesting period	2 years
Minimum \| Restricted Shares and Restricted Stock Units (RSUs), Market-Based
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Vesting period	30 days
Award vesting rights, percentage	50.00%
Maximum \| Restricted Shares and Restricted Stock Units (RSUs), Service-Based
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Vesting period	4 years
Maximum \| Restricted Shares and Restricted Stock Units (RSUs), Performance-Based
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Attainment above threshold performance levels, vesting percentage	150.00%
Maximum \| Restricted Shares and Restricted Stock Units (RSUs), Market-Based
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Vesting period	1 year
Award vesting rights, percentage	50.00%
Maximum \| Restricted Shares and Restricted Stock Units (RSUs), Performance-Based and Market-Based
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Attainment above threshold performance levels, vesting percentage	300.00%