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Shareholders' Equity (Stock Options) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unrecognized compensation cost	$ 21.3
Weighted average period costs expected to be recognized (in years)	3 years 3 months 1 day
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)	$ 14.78	$ 10.07	$ 8.61
Expected stock price volatility (percent)	25.69%	27.63%	26.88%
Risk-free interest rate (percent)	2.62%	2.11%	1.45%
Expected annual dividend yield (percent)	1.34%	1.87%	2.10%
Expected term of option & SARs (in years)	5 years 8 months 4 days	5 years 9 months 26 days	5 years 11 months 26 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares outstanding, Beginning Balance	2,308
Number of shares, Granted	839
Number of shares, Forfeited	(123)
Number of shares, Exercised	(173)
Number of shares outstanding, Ending Balance	2,851	2,308
Number of shares, Exercisable	797
Number of shares, Stock options & SARs expected to vest	2,053
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)	$ 42.75
Weighted average exercise price, Granted (in dollars per share)	59.64
Weighted average exercise price, Forfeited (in dollars per share)	44.59
Weighted average exercise price, Exercised (in dollars per share)	42.20
Weighted average exercise price, Ending Balance (in dollars per share)	47.67	$ 42.75
Exercisable, Weighted Average Exercise Price (in dollars per share)	43.23
Stock options & SARs expected to vest, Weighted Average Exercise Price (in dollars per share)	$ 49.40
Weighted average remaining contractual term, options outstanding (in years)	7 years 9 months 5 days
Weighted average remaining contractual term, options exercisable (in years)	6 years 8 months 16 days
Aggregate intrinsic value, options outstanding	$ 47.2
Aggregate intrinsic value, options exercisable	16.7
Aggregate intrinsic value	$ 4.2	$ 2.7	$ 1.4
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	228
Number of shares, Granted	31
Number of shares, Vested	(66)
Number of shares, Forfeited	(6)
Number of shares outstanding, Ending Balance	187	228
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)	$ 41.66
Weighted average grant date fair value, Granted (in dollars per share)	61.76	$ 48.32	$ 40.27
Weighted average grant date fair value, Vested (in dollars per share)	45.81
Weighted average grant date fair value, Forfeited (in dollars per share)	45.03
Weighted average grant date fair value, Ending Balance (in dollars per share)	$ 43.46	$ 41.66
Total fair value of shares vested	$ 3.0	$ 3.4	$ 4.7

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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 estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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Gross 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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