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

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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Number of options vested.

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Number of share options (or share units) exercised during the current period.

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EQUITY PLANS - Additional Information (Details) $ / shares in Units, $ in Millions	1 Months Ended		5 Months Ended	12 Months Ended
	Jan. 31, 2020 USD ($) shares	Jan. 31, 2019 USD ($) shares	Nov. 30, 2015 shares	Dec. 31, 2019 USD ($) plan $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 09, 2015 shares	Jun. 14, 2011 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of incentive plans \| plan				2
Share based compensation expense \| $				$ 3.8	$ (1.5)	$ 17.8
Share-based income tax benefit (expense) \| $				0.9	(0.4)	4.4
Unrecognized share-based compensation expense \| $				$ 1.9
Period for recognition				7 months 6 days
Intrinsic value of options exercised or unvested Put to the company and canceled \| $					$ 40.5	$ 3.4
Number of common shares repurchased (in shares)				9,079,690	338,648	93,332
Average cost per share, including commissions (in dollar per share) \| $ / shares				$ 24.57	$ 23.50	$ 24.38
RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair values (in dollars per share) \| $ / shares				$ 30.68	$ 27.15	$ 20.15
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of RSUs \| $				$ 5.4	$ 0.6	$ 0.3
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				94,876
Financed Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercised (in shares)			1,864,428
Number of common shares repurchased (in shares)					331,112	93,332
Notes related to financed options (in shares)					1,439,984	0
Put Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercised (in shares)				0		54,976
Vested but unexercised options (in shares)						13,336
Vested but unexercised options (in usd per share) \| $ / shares						$ 24.38
Vested but unexercised options (in shares)					0
Intrinsic value of outstanding stock options \| $					$ 2.9
Reduction to compensation expense \| $					$ 3.2
Liability Classified Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested but unexercised options (in shares)		11,208
Granted (in shares)				9,568
Settlement price of vested RSUs \| $		$ 0.3
2010 Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of outstanding stock options \| $				$ 2.3
2010 Option Plan \| Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available to acquire (in shares)								2,455,368
2010 Option Plan \| Put Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reduction to compensation expense \| $						$ (16.1)
2015 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock available to acquire (in shares)							1,700,000
Shares available for grant (in shares)				1,222,462
2015 Incentive Plan \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage per year				33.00%
Vesting period				3 years
2015 Incentive Plan \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Granted (in shares)				48,525	0	66,644
Subsequent Event \| Liability Classified Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested but unexercised options (in shares)	9,568
Settlement price of vested RSUs \| $	$ 0.2