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Stock Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ 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] |  |  |
Excess Tax Benefits | $ 2.0 | $ 5.0 | $ 3.0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | 16,000,000 |  |
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 | $ 1.0 | $ 1.0 |
Shares issued under employee stock purchase plan | 373,682 | 280,077 | 286,559
Shares issued under employee purchase plan, Average price per share | $ 47.26 | $ 54.67 | $ 47.44
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 | 13,000,000 |  |
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 | $ 58.85 | $ 56.24 | $ 49.34
Unrecognized compensation cost related to stock options expected to be recognized | $ 4.0 |  |
Weighted average period for recognizing unrecognized compensation cost | 10 months 24 days |  |
Total intrinsic value of restricted stock units vested | $ 11.0 | $ 16.0 | $ 12.0
Dividend equivalents accrued on stock units | 25,920 |  |
Performance Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average grant date fair value of granted shares | $ 51.79 | $ 62.17 | $ 54.95
Total intrinsic value of performance units vested | $ 19.0 | $ 17.0 | $ 17.0
Unrecognized compensation cost related to stock options expected to be recognized | $ 24.0 |  |
Weighted average period for recognizing unrecognized compensation cost | 1 year 8 months 12 days |  |
Dividend equivalents accrued on stock units | 42,925 |  |
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 | 2,200,000 |  |
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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