Stock Based Compensation (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized	15.0
Grants in period	0.7	0.8	0.8
Risk free interest rate		2.55%
Expected dividend rate		5.60%	5.60%
Equity based compensation, noncash expense	$ 11.9	$ 13.6	$ 9.4
Equity based compensation, amount capitalized	(0.9)	$ (0.9)	$ 0.0
Compensation cost not yet recognized	$ 13.7
Weighted average remaining contractual term	2 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period	1 year
Expected volatility rate	20.00%	20.00%	29.00%
Risk free interest rate	1.20%		2.43%
Expected dividend rate	5.90%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period	5 years
Expected volatility rate	23.00%	21.00%	32.00%
Risk free interest rate	1.30%		2.53%
Expected dividend rate	6.00%

Share-based Payment Arrangement, Noncash Expense, Gross

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- Definition

Amount of cost capitalized for award under share-based payment arrangement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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

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Gross number of share options (or share units) granted during the period.

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- Definition

Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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