Share-Based Awards (Details - Options) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary Of Option Activity [Abstract]
Weighted average grant date fair value of options granted	$ 0	$ 0	$ 7.90
Total intrinsic value of options exercised (in millions of U.S. dollars)	$ 8.7	$ 24.8	$ 8.8
Proceeds from option exercises (in millions of U.S. dollars)	14.7	49.6	29.3
Weighted average remaining contractual term	4 years 8 months 12 days
Aggregate intrinsic value of options outstanding, exercisable, vested and expected to vest	$ 17.5
Activity related to share options
Outstanding at January 1, 2014	636,279
Granted	0	0	120,210
Exercised	(225,329)	(819,764)	(518,548)
Forfeited or expired	(603)
Outstanding at December 31, 2014	410,347	636,279
Options exercisable at December 31, 2014	379,799
Options vested and expected to vest at December 31, 2014	409,841
The weighted average exercise price is as follows:
Outstanding at January 1, 2014	$ 70.28
Granted	$ 0
Exercised	$ 67.87
Forfeited or expired	$ 108.20
Outstanding at December 31, 2014	$ 71.55	$ 70.28
Options exercisable at December 31, 2014	$ 71.62
Options vested and expected to vest at December 31, 2014	$ 71.55
Share Options [Member]
Assumptions:
Expected life			6 years
Expected volatility			17.70%
Risk-free interest rate			1.00%
Dividend yield			2.70%