Stock Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess Tax Benefits	$ 2.0	$ 2.0	$ 5.0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	8,000,000
Percentage Of Fair Market Value Being Expected Purchase Price Of Employee Stock Purchase Plan	95.00%
Minimum Holding Period for Stock Purchased through Employee Stock Purchase Plan	3 months
Percentage Of Fair Market Value Being Expected Purchase Price Of Employee Stock Purchase Plan Non Represented	90.00%
Maximum Percentage Limit Of Base Pay For Employees For Purchasing Shares	10.00%
Employee Stock Ownership Plan (ESOP), Compensation Expense	$ 2.0	$ 2.0
Shares issued under employee stock purchase plan	326,634	373,682	280,077
Shares issued under employee purchase plan, Average price per share	$ 56.87	$ 47.26	$ 54.67
Performance Share Risk Free Rate Assumption	0.22%	1.36%	2.47%
Performance Share Volatility Rate Assumption	27.31%	15.00%	16.74%
Various [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	8,000,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of granted shares	$ 58.02	$ 58.85	$ 56.24
Unrecognized compensation cost related to stock options expected to be recognized	$ 4.0
Weighted average period for recognizing unrecognized compensation cost	1 year 1 month 6 days
Total intrinsic value of restricted stock units vested	$ 17.0	$ 11.0	$ 16.0
Dividend equivalents accrued on stock units	21,801
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value of granted shares	$ 65.57	$ 51.79	$ 62.17
Total intrinsic value of performance units vested	$ 28.0	$ 19.0	$ 17.0
Unrecognized compensation cost related to stock options expected to be recognized	$ 23.0
Weighted average period for recognizing unrecognized compensation cost	1 year 7 months 6 days
Dividend equivalents accrued on stock units	37,371
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	100.00%
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,900,000
Minimum \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	1 year
Minimum \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period	3 years
Minimum \| Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%
Maximum [Member] \| Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Maximum [Member] \| Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	200.00%

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