Amount, after tax, of expense for award under share-based payment arrangement.

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Aggregate number of common shares reserved for future issuance.

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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 cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised.

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Amount of cash inflow from exercise of option 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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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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 weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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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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Weighted average price of options that were either forfeited or expired.

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Share-based Compensation Plans

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Stock Based Compensation - Additional information (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Oct. 08, 2020 USD ($)	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) plan $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based compensation plans \| plan				0
Incremental stock-based compensation expense	$ 2.0
Shares authorized (in shares) \| shares		17,000,000.0
Capital shares reserved for future issuance (in shares) \| shares		11,000,000
Aggregate value of shares withheld to satisfy tax requirement		$ 4.1	$ 2.1	$ 2.6
Unrecognized compensation costs, period for recognition		2 years
Granted (in dollars per share) \| $ / shares			$ 77.47	$ 76.67
Exercised (in dollars per share) \| $ / shares			28.18	28.99
Canceled/Forfeited (in dollars per share) \| $ / shares			$ 42.67	$ 54.13
Fair value of options vested		$ 2.8	$ 1.9	$ 1.5
Aggregate intrinsic value of stock options exercised		9.6	14.2	14.3
Cash receipts from stock options exercised		9.4	11.0	8.3
Proceeds from stock option exercises		1.6	0.0	0.0
Net Parent Investment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from stock option exercises		$ 7.6	11.0	8.3
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		5 years
Expiration period		10 years
Share-based compensation expense		$ 22.5
Granted (in dollars per share) \| $ / shares		$ 33.51
Exercised (in dollars per share) \| $ / shares		18.70
Canceled/Forfeited (in dollars per share) \| $ / shares		$ 30.10
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		5 years
Share-based compensation expense			$ 13.1
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense				$ 13.8
Stock Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in dollars per share) \| $ / shares		$ 33.64	$ 77.15	$ 77.78
Vested (in dollars per share) \| $ / shares		28.49	74.77	41.28
Forfeited (in dollars per share) \| $ / shares		$ 29.76	$ 56.69	$ 53.23