Shareholders' Equity (Stock Options) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unrecognized compensation cost	$ 18.8
Weighted average period costs expected to be recognized (in years)	3 years 2 months 13 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 Stock options & SARs (in dollars per share)	$ 8.61	$ 11.37	$ 13.40
Expected stock price volatility (percent)	26.88%	25.96%	34.85%
Risk-free interest rate (percent)	1.45%	1.49%	1.53%
Expected annual dividend yield (percent)	2.10%	1.55%	1.80%
Expected term of option & SARs (in years)	5 years 11 months 26 days	5 years 8 months 12 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, 2015	920
Number of shares, Granted	1,001
Number of shares, Forfeited	(93)
Number of shares, Exercised	(75)
Number of shares, Outstanding at December 31, 2016	1,753	920
Number of shares, Exercisable	340
Number of shares, Stock options & SARs expected to vest	1,414
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, 2015 (in dollars per share)	$ 43.47
Weighted average exercise price, Granted (in dollars per share)	39.99
Weighted average exercise price, Forfeited (in dollars per share)	46.78
Weighted average exercise price, Exercised (in dollars per share)	23.55
Weighted average exercise price, Outstanding at December 31, 2016 (in dollars per share)	42.16	$ 43.47
Exercisable, Weighted Average Exercise Price (in dollars per share)	37.96
Stock options & SARs expected to vest, Weighted Average Exercise Price (in dollars per share)	$ 43.17
Weighted average remaining contractual term, options outstanding (in years)	8 years 12 days
Weighted average remaining contractual term, options exercisable (in years)	4 years 9 months 7 days
Aggregate intrinsic value, options outstanding	$ 7.5
Aggregate intrinsic value, options exercisable	3.2
Aggregate intrinsic value	$ 1.4	$ 2.8	$ 10.7
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, 2015	353
Number of shares, Granted	83
Number of shares, Vested	(110)
Number of shares, Forfeited	(29)
Number of shares, Outstanding at December 31, 2016	297	353
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, 2015 (in dollars per share)	$ 41.23
Weighted average grant date fair value, Granted (in dollars per share)	40.27	$ 45.75	$ 43.21
Weighted average grant date fair value, Vested (in dollars per share)	43.16
Weighted average grant date fair value, Forfeited (in dollars per share)	39.62
Weighted average grant date fair value, Outstanding at December 31, 2016 (in dollars per share)	$ 41.01	$ 41.23
Total fair value of shares vested	$ 4.7	$ 6.0	$ 11.6