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Shareholders' Equity (Awards) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 28.7
Weighted average period costs expected to be recognized (in years)	3 years 4 months 24 days
Stock Options and Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value of Stock options & SARs (in dollars per share)	$ 20.59	$ 14.78	$ 10.07
Expected stock price volatility (percent)	26.59%	25.69%	27.63%
Risk-free interest rate (percent)	2.58%	2.62%	2.11%
Expected annual dividend yield (percent)	1.08%	1.34%	1.87%
Expected term of option & SARs (in years)	5 years 7 months 6 days	5 years 8 months 12 days	5 years 9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares outstanding, Beginning Balance	2,851
Number of shares, Granted	860
Number of shares, Forfeited	(106)
Number of shares, Exercised	(352)
Number of shares outstanding, Ending Balance	3,253	2,851
Number of shares, Exercisable	1,036
Number of shares, Stock options & SARs expected to vest	2,217
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, Beginning Balance (in dollars per share)	$ 47.67
Weighted average exercise price, Granted (in dollars per share)	78.78
Weighted average exercise price, Forfeited (in dollars per share)	58.50
Weighted average exercise price, Exercised (in dollars per share)	43.75
Weighted average exercise price, Ending Balance (in dollars per share)	55.97	$ 47.67
Exercisable, Weighted Average Exercise Price (in dollars per share)	46.05
Stock options & SARs expected to vest, Weighted Average Exercise Price (in dollars per share)	$ 60.61
Weighted average remaining contractual term, options outstanding (in years)	7 years 6 months
Weighted average remaining contractual term, options exercisable (in years)	6 years 3 months 18 days
Aggregate intrinsic value, options outstanding	$ 181.7
Aggregate intrinsic value, options exercisable	68.2
Aggregate intrinsic value	$ 17.0	$ 4.2	$ 2.7
Restricted Stock Units (RSUs) and Performance Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of shares outstanding, Beginning Balance	187
Number of shares, Granted	38
Number of shares, Vested	(55)
Number of shares, Forfeited	(1)
Number of shares outstanding, Ending Balance	169	187
Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant date fair value, Beginning Balance (in dollars per share)	$ 43.46
Weighted average grant date fair value, Granted (in dollars per share)	78.64	$ 61.76	$ 48.32
Weighted average grant date fair value, Vested (in dollars per share)	51.43
Weighted average grant date fair value, Forfeited (in dollars per share)	43.68
Weighted average grant date fair value, Ending Balance (in dollars per share)	$ 48.94	$ 43.46
Total fair value of shares vested	$ 2.8	$ 3.0	$ 3.4

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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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- Definition

Number of non-vested options outstanding.

+ References

No definition available.

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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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- Definition

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

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