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

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Amount of cost not yet recognized for nonvested award under share-based payment 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 tax benefit 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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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 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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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 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 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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Stock-based Compensation - Narrative (Details) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021 USD ($) shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Nov. 27, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Aggregate number of shares of common stock issued or transferred under the incentive stock awards plan (in shares) \| shares	2,558,933	2,558,933
Conversion rate (one for every two)					0.5
Stock based compensation expense		$ 21.3	$ 41.2	$ 26.5
Tax benefit from exercise of stock options		5.5	10.1	6.6
Excess tax benefit from share-based compensation, operating activities		$ 0.2	$ 2.6	$ 4.8
Stock options granted (in shares) \| shares		150,000	400,000	293,000
Aggregate intrinsic value of options exercised		$ 1.0	$ 24.9	$ 6.5
Fair value of options vested		$ 1.0	7.8	4.6
Continuing Operations
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock based compensation expense			$ 5.4	$ 5.4
2015 Incentive Award Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unexercised options lapse period (in years)		10 years
2001 Incentive Award Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Unexercised options lapse period (in years)		10 years
Employee Matters Agreement
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Incremental compensation expense		$ 5.2
Retirement-Related Modifications
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Converted wards, incremental cost		4.5
Converted awards, incremental cost related to accelerated vesting of equity awards		$ 8.7
Converted awards, incremental cost recognized	$ 13.2
Employee Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Aggregate number of shares of common stock issued or transferred under the incentive stock awards plan (in shares) \| shares	37,270	37,270
Unrecognized compensation expense related to non-vested award	$ 30.6	$ 30.6
Unrecognized compensation expense related to non-vested award, recognition period (in years)		1 year 8 months 15 days
Weighted average grant date fair value (in dollars per share) \| $ / shares		$ 39.62	$ 38.55	$ 42.07
Employee Stock \| Minimum \| 2015 Incentive Award Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)		1 year
Employee Stock \| Minimum \| 2001 Incentive Award Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)		1 year
Employee Stock \| Maximum \| 2015 Incentive Award Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)		3 years
Employee Stock \| Maximum \| 2001 Incentive Award Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)		5 years
Stock options
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Dividend Yield		0.00%	0.40%	0.30%
Restricted Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock granted (in shares) \| shares		521,000	375,000	225,000
Weighted average grant date fair value (in dollars per share) \| $ / shares		$ 44.44	$ 41.45	$ 54.28
Total fair value of shares vesting		$ 7.8	$ 10.5	$ 14.6
Restricted Stock \| Minimum \| 2015 Incentive Award Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)		1 year
Restricted Stock \| Maximum \| 2015 Incentive Award Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)		3 years
Performance Share Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total fair value of shares vesting		$ 7.1	$ 18.4	$ 22.1
Performance Share Units \| Minimum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Performance percentage		0.00%
Performance criteria is met \| Performance Share Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Award vesting rights (percentage)		33.33%
One-year service period \| Performance Share Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Award vesting rights (percentage)		33.33%
One-year service period \| Performance Share Units \| Minimum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)		1 year
One-year service period \| Performance Share Units \| Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Vesting period (in years)		3 years
Two-year service period \| Performance Share Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Award vesting rights (percentage)		33.33%
Terms and conditions scenario 1 \| Performance Share Units \| Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Performance percentage		100.00%
Terms and conditions scenario 2 \| Performance Share Units \| Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Performance percentage		200.00%
Terms and conditions scenario 3 \| Performance Share Units \| Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Performance percentage		260.00%
Terms and conditions scenario 4 \| Performance Share Units \| Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Performance percentage		400.00%