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Share-based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 01, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock authorized for issuance under the plan (in shares)	30,200,000
Capital shares reserved for future issuance (in shares)	2,600,000
Share-based payment award, expiration period	10 years
Tax benefit from compensation expense	$ 3.7	$ 4.0	$ 5.4
Share-based compensation expense, after-tax	14.1	14.9	20.2
Cash related stock options exercises	$ 7.9	$ 24.7	$ 50.7
Black Scholes valuation assumptions for stock option grants [Abstract]
Options granted, weighted-average grant-date fair value (in dollars per share)	$ 28.31	$ 20.28	$ 18.66
Number of Options Granted But Not Exercised
Options exercisable (in shares)	605,000	388,000	628,000	1,044,000
Options vested and expected to vest (in shares)	622,000	818,000	835,000	1,287,000
Beginning (in shares)	1,235,000	1,504,000	2,364,000
Granted (in shares)	235,000	302,000	380,000
Conversion impact from Livent spin (in shares)			210,000
Exercised (in shares)	(166,000)	(549,000)	(1,414,000)
Forfeited (in shares)	(50,000)	(22,000)	(36,000)
Ending (in shares)	1,254,000	1,235,000	1,504,000	2,364,000
Weighted-Average Remaining Contractual Life	6 years 2 months 12 days	7 years	6 years 6 months	6 years
Weighted-Average Exercise Price Per Share
Beginning (in dollars per share)	$ 70.44	$ 58.06	$ 52.87
Granted (in dollars per share)	105.00	92.24	75.76
Conversion impact from Livent spin (in dollars per share)			53.09
Exercised (in dollars per share)	49.56	48.02	39.17
Forfeited (in dollars per share)	89.18	81.84	67.82
Ending (in dollars per share)	$ 78.95	$ 70.44	$ 58.06	$ 52.87
Aggregate Intrinsic Value (in Millions)
Options outstanding, aggregate intrinsic value	$ 38.8	$ 54.9	$ 62.8	$ 52.5
Options exercised, aggregate intrinsic value	9.8	31.3	67.2
Options exercisable, intrinsic value	$ 26.6
Options exercisable, weighted-average remaining contractual term (in years)	4 years 2 months 12 days
Options exercisable, weighted-average exercise price per share (in dollars per share)	$ 65.97
Livent
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock owned (in shares)					123,000,000
Discontinued operations, net of income taxes
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense, after-tax	$ 0.0	2.2	0.1
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period	3 years
Share-based payment award, expiration period	10 years
Tax benefit from compensation expense	$ 1.0	1.1	1.5
Share-based compensation expense, after-tax	$ 3.7	$ 4.0	$ 5.7
Fair value assumptions, forfeiture rate	4.00%
Black Scholes valuation assumptions for stock option grants [Abstract]
Expected dividend yield	1.83%	1.91%	1.83%
Expected volatility	32.75%	26.60%	26.07%
Expected life (in years)	6 years 6 months	6 years 6 months	6 years 6 months
Risk-free interest rate	0.92%	1.19%	2.53%
Aggregate Intrinsic Value (in Millions)
Unrecognized compensation cost	$ 5.2
Unrecognized compensation cost, weighted-average period of recognition (in years)	1 year 9 months 14 days
Restricted Stock Units (RSUs) related to Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares of common stock credited to directors' accounts for RSUs (in shares)	267,524	267,988
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period	3 years
Tax benefit from compensation expense	$ 1.9	$ 2.0	$ 2.2
Share-based compensation expense, after-tax	$ 7.2	$ 7.4	$ 8.2
Fair value assumptions, forfeiture rate	2.00%
Aggregate Intrinsic Value (in Millions)
Unrecognized compensation cost	$ 13.0
Unrecognized compensation cost, weighted-average period of recognition (in years)	1 year 10 months 2 days
Number of awards
Nonvested awards, beginning (in shares)	298,000	302,000	459,000
Granted (in shares)	95,000	92,000	108,000
Conversion impact from Livent spin (in shares)		(29,000)
Vested (in shares)	(108,000)	(84,000)	(223,000)
Forfeited (in shares)	(15,000)	(12,000)	(13,000)
Nonvested awards, ending (in shares)	270,000	298,000	302,000	459,000
Weighted-Average Grant Date Fair Value Per Share
Nonvested awards, beginning (in dollars per share)	$ 79.91	$ 67.89	$ 55.75
Granted (in dollars per share)	102.10	91.83	76.22
Conversion impact from Livent spin (in dollars per share)		67.46
Vested (in dollars per share)	73.82	50.14	37.54
Forfeited (in dollars per share)	90.05	77.42	69.69
Nonvested awards, ending (in dollars per share)	$ 89.56	$ 79.91	$ 67.89	$ 55.75
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit from compensation expense	$ 0.8	$ 0.9	$ 1.7
Share-based compensation expense, after-tax	$ 3.2	$ 3.5	$ 6.3
Number of awards
Nonvested awards, beginning (in shares)	202,000	206,000	335,000
Granted (in shares)	79,000	111,000	106,000
Conversion impact from Livent spin (in shares)		(12,000)
Vested (in shares)	(86,000)	(115,000)	(222,000)
Forfeited (in shares)	0	0	(1,000)
Nonvested awards, ending (in shares)	195,000	202,000	206,000	335,000
Weighted-Average Grant Date Fair Value Per Share
Nonvested awards, beginning (in dollars per share)	$ 88.48	$ 72.06	$ 56.42
Granted (in dollars per share)	103.26	108.74	83.89
Conversion impact from Livent spin (in dollars per share)		84.58
Vested (in dollars per share)	77.44	58.37	42.18
Forfeited (in dollars per share)	0	0	78.92
Nonvested awards, ending (in dollars per share)	$ 96.18	$ 88.48	$ 72.06	$ 56.42

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