Shareholder's Equity (Schedule of Stock Option Activity (Parenthetical) (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]
Total intrinsic value with options exercised	$ 2.2
Aggregate intrinsic value of options outstanding	4.9
Total intrinsic value of options vested or expected to vest	4.9
Vested or expected to vest at end of period, Number of Shares	180,983
Vested or expected to vest at end of period, weighted average exercise price	$ 22.73
Vested or expected to vest at end of period, Weighted Average Remaining Contractual Life (in years)	1 year 292 days
Total Intrinsic value of options exercisable	$ 4.9
Exercisable at end of period, Number of Shares	180,983
Exercisable at end of period, Weighted Average Exercise Price	$ 22.73
Exercisable at end of period, Weighted Average Remaining Contractual Life (in years)	1 year 292 days