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Period over which the awards are measured for fair value.

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Stock Appreciation Rights, Weighted Average Exercise Price

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Number of shares issued pursuant to the terms of a deferred compensation 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 equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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 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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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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Number of non-option equity instruments exercised by participants.

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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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Net 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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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. 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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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. 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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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. 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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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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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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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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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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Number of share options (or share units) exercised during the current period.

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Stock-Based Compensation - Vesting and Deferred Compensation Plan (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	May 06, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock-based compensation expense
Unrecognized compensation cost related to awards other than options		$ 33.5
Weighted average period of recognition of unrecognized compensation cost related to restricted stock awards		1 year 2 months 12 days
Stock option awards
Number of Shares
Outstanding at the beginning of the period (in shares)		1,825,000
Stock options granted (in shares)		395,000
Options exercised (in shares)		(229,000)
Options forfeited (in shares)		(165,000)
Outstanding at the end of the period (in shares)		1,826,000	1,825,000
Vested and exercisable at the end of the period (in shares)		768,000
Intrinsic value of options exercised		$ 11.9	$ 25.4	$ 18.4
Fair value of options vested		$ 7.9	$ 6.3	10.2
Weighted Average Price
Outstanding at the beginning of the period (in dollars per share)		$ 101.95
Options granted (in dollars per share)		159.49
Options exercised (in dollars per share)		95.49
Options forfeited (in dollars per share)		119.11
Outstanding at the end of the period (in dollars per share)		114.03	$ 101.95
Vested and exercisable at the end of the period (in dollars per share)		$ 98.25
Weighted average contractual term		7 years
The weighted average contractual term of options exercisable		5 years 4 months 24 days
Aggregate intrinsic value of options outstanding		$ 78.8
Aggregate intrinsic value of options vested and exercisable		44.5
Stock-based compensation expense
Unrecognized compensation cost related to awards other than options		$ 6.6
Performance share and restricted stock awards
Vesting period of shares awarded under the Program		3 years
Restricted stock awards
Stock-based compensation expense
Unrecognized compensation cost related to awards other than options		$ 6.6
Weighted average period of recognition of unrecognized compensation cost related to restricted stock awards		1 year 8 months 12 days
Performance share and restricted stock awards
Vesting period of shares awarded under the Program		3 years
Intrinsic value of shares vested during year ended December 31		$ 9.6	$ 5.6	11.7
Fair value of shares vested during year ended December 31		$ 7.5	$ 4.6	$ 9.8
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (shares)		173,000
Awards granted (in shares)		69,000
Awards vested (in shares)		(66,000)
Awards forfeited (in shares)		(10,000)
Outstanding at end of period (shares)		166,000	173,000
Outstanding at beginning of period (in dollars per share)		$ 109.62
Awards granted (in dollars per share)		147.78	$ 112.70	$ 114.27
Awards vested (in dollars per share)		114.39
Awards forfeited (in dollars per share)		123.70
Outstanding at end of period (in dollars per share)		$ 122.88	$ 109.62
Weighted average contractual term		9 months 18 days
Aggregate intrinsic value		$ 26.0
Performance share awards
Stock-based compensation expense
Unrecognized compensation cost related to awards other than options		$ 7.7
Weighted average period of recognition of unrecognized compensation cost related to restricted stock awards		1 year 9 months 18 days
Performance share and restricted stock awards
Vesting period of shares awarded under the Program		3 years
Intrinsic value of shares vested during year ended December 31		$ 11.3	$ 5.9	$ 5.2
Fair value of shares vested during year ended December 31		$ 12.9	$ 5.0	$ 5.3
Measurement period		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (shares)		143,000
Awards granted (in shares)		46,000
Awards vested (in shares)		(80,000)
Awards converted (in shares)		36,000
Awards forfeited (in shares)		(9,000)
Outstanding at end of period (shares)		136,000	143,000
Outstanding at beginning of period (in dollars per share)		$ 143.94
Awards granted (in dollars per share)		222.50	$ 149.27	$ 140.20
Awards vested (in dollars per share)		141.79
Awards converted (in dollars per share)		141.81
Awards forfeited (in dollars per share)		167.03
Outstanding at end of period (in dollars per share)		$ 170.34	$ 143.94
Weighted average contractual term		10 months 24 days
Aggregate intrinsic value		$ 21.2
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Awards granted (in shares)		8,000	12,000	13,000
Outstanding at beginning of period (in dollars per share)		$ 110.79	$ 108.72
Outstanding at end of period (in dollars per share)		$ 161.41	$ 110.79	$ 108.72
Stock appreciation rights
Stock-based compensation expense
Unrecognized compensation cost related to awards other than options		$ 2.0
Weighted average period of recognition of unrecognized compensation cost related to restricted stock awards		3 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (shares)		362,000
Awards exercised (in shares)		(3,000)
Awards forfeited (in shares)		(78,000)
Outstanding at end of period (shares)		281,000	362,000
Weighted average contractual term		3 months 18 days
Aggregate intrinsic value		$ 13.9
Stock Appreciation Rights, Weighted Average Exercise Price [Abstract]
Outstanding at beginning of period (in dollars per share)		$ 106.85
Awards exercised (in dollars per share)		106.85
Awards forfeited (in dollars per share)		106.85
Outstanding at end of period (in dollars per share)		$ 106.85	$ 106.85
Eligible Directors \| Restricted stock units
Performance share and restricted stock awards
Vesting period of shares awarded under the Program	1 year
Board member retirement age for vesting	72 years
Consecutive years of service on the board for vesting	18 years
Deferred Compensation Equity
Number of Shares
Number of common stock deferred (in shares)		84,000	86,000
Performance share and restricted stock awards
Number of common stock deferred (in shares)		84,000	86,000