Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0
Options, outstanding, intrinsic value	$ 3.0
Options, exercisable, intrinsic value	3.0
Options, exercised, intrinsic value	$ 18.7
Term for outstanding stock	4 years 1 month 6 days
Term for exercisable stock	4 years 1 month 6 days
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	553,876
Vesting period	3 years
Actual number of shares that may be issued, percent, minimum	0.00%
Actual number of shares that may be issued, percent, maximum	200.00%
Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized, stock options	$ 20.9
Compensation cost not yet recognized, period for recognition	2 years 1 month 6 days
Tax benefit from compensation expense	$ 5.4	$ 3.4
Incentive Award Plan \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	787,287
Restricted stock units, conversion of stock, conversion rights (in shares)	1
Compensation not yet recognized, stock options	$ 9.8
Compensation cost not yet recognized, period for recognition	2 years 1 month 6 days
Employees and Officers \| Incentive Award Plan \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Director \| Incentive Award Plan \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year

Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Minimum

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Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

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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 option under share-based payment arrangement.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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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 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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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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

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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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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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