Amount of shares earned as a % of target award.

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Share-based Compensation Arrangement by Share-based Payment Award, Award percentage attained

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Award percentage earned based on metric over the performance period.

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

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Number of shares issued pursuant to the terms of a deferred compensation arrangement.

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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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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made 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 estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Equity Awards - Restricted Stock Units Narrative (Details) - Restricted Stock Units [Member] - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares issued related to director fee deferrals				995
Number of Unvested Restricted Stock Units Granted				234,566
Unrecognized unvested restricted shares-based compensation expense	$ 9.1			$ 9.1
Weighted-average period for recognition of the unrecognized unvested restricted shares-based compensation expense				2 years 1 month 6 days
Plan 1 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Stock Units Granted				113,504
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period				3 years
Plan 7 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Stock Units Granted				21,112
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period				1 year
Plan 8 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Stock Units Granted				72,962
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period				3 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate				0.28%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate				35.50%
3 year EPS CAGR metric [Member] \| Maximum [Member] \| Plan 8 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award percentage earned based on metric over the performance period				50.00%
Total shareholder return metric [Member] \| Plan 3 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Unvested Restricted Stock Units Granted				25,993
Share-based Compensation Arrangement by Share-based Payment Award, Award percentage attained		126.20%
Total shareholder return metric [Member] \| Minimum [Member] \| Plan 8 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Amount of shares earned % of target award				0.00%
Total shareholder return metric [Member] \| Maximum [Member] \| Plan 8 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award percentage earned based on metric over the performance period				50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Amount of shares earned % of target award				200.00%
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares-based compensation expense	$ 3.2		$ 2.7	$ 5.7	$ 4.7