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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Summary Of Significant Accounting Policies [Line Items] |  |  |
Cash equivalents | $ 531.8 | $ 381.6 |
Provision to accounts receivable |  | $ 2.7 |
Anti-dilutive options to purchase common shares | 0.4 | 1.3 | 0.7
Compensation cost recognized for stock-based awards | $ 5.3 | $ 7.7 | $ 6.4
Income tax benefit recognized in the income statement for stock-based awards | 1.1 | $ 3.1 | $ 2.6
Weighted-average fair value per option granted |  | $ 8.76 | $ 9.91
Total cash received as a result of stock option exercises | 18.8 | $ 2.0 | $ 18.9
Tax benefit realized as a result of stock option exercises and the vesting of other share-based awards | 3.7 | 2.1 | 2.9
Total intrinsic value of stock options exercised | 5.1 | 0.7 | 3.7
Exchange losses related to foreign currency transactions | $ 0.5 | $ 2.3 | $ 1.3
Minimum [Member] | Buildings And Building Improvements [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets | 5 years |  |
Minimum [Member] | Machinery And Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets | 2 years |  |
Minimum [Member] | Furniture And Fixtures [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets | 2 years |  |
Minimum [Member] | Vehicles [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets | 2 years |  |
Maximum [Member] | Buildings And Building Improvements [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets | 40 years |  |
Maximum [Member] | Machinery And Equipment [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets | 10 years |  |
Maximum [Member] | Furniture And Fixtures [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets | 10 years |  |
Maximum [Member] | Vehicles [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Useful lives of the assets | 5 years |  |

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