Shareholders' Equity (Awards) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 33.1
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)	$ 22.62	$ 20.59	$ 14.78
Expected stock price volatility (percent)	26.89%	26.59%	25.69%
Risk-free interest rate (percent)	0.89%	2.58%	2.62%
Expected annual dividend yield (percent)	0.82%	1.08%	1.34%
Expected term of option & SARs (in years)	5 years 6 months	5 years 7 months 6 days	5 years 8 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares outstanding, Beginning Balance	3,253
Number of shares, Granted	859
Number of shares, Forfeited	(250)
Number of shares, Exercised	(526)
Number of shares outstanding, Ending Balance	3,336	3,253
Number of shares, Exercisable	1,199
Number of shares, Stock options & SARs expected to vest	2,137
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)	$ 55.97
Weighted average exercise price, Granted (in dollars per share)	95.84
Weighted average exercise price, Forfeited (in dollars per share)	72.81
Weighted average exercise price, Exercised (in dollars per share)	45.07
Weighted average exercise price, Ending Balance (in dollars per share)	66.76	$ 55.97
Exercisable, Weighted Average Exercise Price (in dollars per share)	52.18
Stock options & SARs expected to vest, Weighted Average Exercise Price (in dollars per share)	$ 74.94
Weighted average remaining contractual term, options outstanding (in years)	7 years 2 months 12 days
Weighted average remaining contractual term, options exercisable (in years)	5 years 9 months 18 days
Aggregate intrinsic value, options outstanding	$ 150.9
Aggregate intrinsic value, options exercisable	71.7
Aggregate intrinsic value	$ 26.6	$ 17.0	$ 4.2
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	169
Number of shares, Granted	37
Number of shares, Vested	(140)
Number of shares, Forfeited	(5)
Number of shares outstanding, Ending Balance	61	169
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)	$ 48.94
Weighted average grant date fair value, Granted (in dollars per share)	85.45	$ 78.64	$ 61.76
Weighted average grant date fair value, Vested (in dollars per share)	43.99
Weighted average grant date fair value, Forfeited (in dollars per share)	79.30
Weighted average grant date fair value, Ending Balance (in dollars per share)	$ 77.03	$ 48.94
Total fair value of shares vested	$ 6.2	$ 2.8	$ 3.0