Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]
Cash equivalents	$ 381.6	$ 314.1
Provision to accounts receivable		$ 2.7
Long-term investments	$ 1.0
Anti-dilutive options to purchase common shares	1.3	0.7	1.2
Compensation cost recognized for stock-based awards	$ 7.7	$ 6.4	$ 7.1
Income tax benefit recognized in the income statement for stock-based awards	$ 3.1	$ 2.6	$ 2.6
Weighted-average fair value per option granted	$ 8.76	$ 9.91	$ 7.87
Total cash received as a result of stock option exercises	$ 2.0	$ 18.9	$ 11.2
Tax benefit realized as a result of stock option exercises and the vesting of other share-based awards	2.1	2.9	2.2
Total intrinsic value of stock options exercised	0.7	3.7	3.2
Exchange losses related to foreign currency transactions	$ 2.3	$ 1.3	$ 0.9
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