Shareholders' Equity (Stock Options) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity [Abstract]
Unrecognized compensation cost	$ 9.6
Weighted average period costs expected to be recognized	3 years 0 months 14 days
Stock Options and Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value of SARs	$ 13.40	$ 9.77	$ 7.38
Expected volatility rate	34.85%	35.88%	35.84%
Risk free interest rate	1.53%	1.04%	0.62%
Expected annual dividend yield	1.80%	1.79%	2.00%
Expected term of option (years)	6 years 4 months 24 days	6 years 3 months 18 days	6 years 4 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares, Outstanding at December 31, 2013	1,130
Number of shares, Granted	109
Number of shares, Forfeited	(68)
Number of shares, Exercised	(718)
Number of shares, Outstanding at December 31, 2014	453	1,130
Number of shares, Exercisable	245
Number of shares, SARs expected to vest	208
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, Outstanding at December 31, 2013	$ 25.55
Weighted average exercise price, Granted	$ 44.56
Weighted average exercise price, Forfeited	$ 40.76
Weighted average exercise price, Exercised	$ 24.90
Weighted average exercise price, Outstanding at December 31, 2014	$ 28.85	$ 25.55
Exercisable, Weighted Average Exercise Price	$ 25.38
SARs expected to vest, Weighted Average Exercise Price	$ 32.93
Weighted average remaining contractual term, options outstanding (years)	5 years 11 months 25 days
Weighted average remaining contractual term, options exercisable (years)	4 years 4 months 26 days
Aggregate intrinsic value, options outstanding	7.3
Aggregate intrinsic value, options exercisable	4.8
Aggregate intrinsic value	10.7	4.7	3.3
Restricted Stock Units (RSUs) and Performance Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of shares, Outstanding at December 31, 2013	476
Number of shares, Granted	184
Number of shares, Vested	(259)
Number of shares, Forfeited	(79)
Number of shares, Outstanding at December 31, 2014	322	476
Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant date fair value, Outstanding at December 31, 2013	$ 27.14
Weighted average grant date fair value, Granted	$ 43.21	$ 33.02	$ 26.18
Weighted average grant date fair value, Vested	$ 28.54
Weighted average grant date fair value, Forfeited	$ 35.10
Weighted average grant date fair value, Outstanding at December 31, 2014	$ 33.14	$ 27.14
Total fair value of shares vested	$ 11.6	$ 7.1	$ 4.4