Common Shares And Stock-Based Awards Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of common shares	2,100,000	3,200,000	3,700,000
Repurchase of common shares, value	$ 41.2	$ 47.1	$ 56.3
Repurchase of common shares, average price per share	$ 19.65	$ 14.59	$ 15.13
Additional shares available for issuance	2,200,000
Number of options, exercisable	2,360,000
Weighted-average exercise price of options exercisable	$ 20.63
2012 Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of common shares, authorized amount		100
Repurchase of common shares, remaining authorized amount	$ 46.9
Employee Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Contractual life of options	10 years
Non-Employee Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options, exercisable	2,400,000	3,500,000	3,700,000
Weighted-average exercise price of options exercisable	$ 20.63	$ 20.46	$ 20.32