Share-Based Compensation (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Stock options
Share-based compensation (Textual) [Abstract]
Forfeiture rate (as a percent)			3.00%
Compensation expense	$ 1.1	$ 1.2	$ 3.8	$ 3.3
Unrecognized compensation cost	5.0		5.0
Weighted average remaining contractual term (in years)			1 year 10 months 24 days
Stock options | Options granted current period
Share-based compensation (Textual) [Abstract]
Granted stock options (in shares)			407,075
Number of annual installment in which stock option exercisable (in installments)			3
Period from grant date for annual installment (in years)			1 year
Stock options, time until expiration (in years)			10 years
Weighted-average fair value stock option (in dollars per share)			$ 7.86
Restricted stock units (RSUs)
Share-based compensation (Textual) [Abstract]
Number of annual installment in which stock option exercisable (in installments)			3
Period from grant date for annual installment (in years)			1 year
Forfeiture rate (as a percent)			3.00%
Compensation expense	1.0	0.7	2.9	1.7
Unrecognized compensation cost	8.7		8.7
Weighted average remaining contractual term (in years)			2 years 3 months 18 days
Restricted stock units (RSUs) | Distribution first | Units awarded during period
Share-based compensation (Textual) [Abstract]
Restricted stock (in shares)			210,673
Fair value grant (in dollars per share)			$ 22.29
Performance share units
Share-based compensation (Textual) [Abstract]
Forfeiture rate (as a percent)			3.00%
Compensation expense	0.3	0.2	0.9	0.4
Unrecognized compensation cost	$ 3.2		$ 3.2
Weighted average remaining contractual term (in years)			2 years 4 months 24 days
Percentage of award determined by the Company's three year TSR (as a percent)			50.00%
Percentage of award determined by pre-tax return on capital (as a percent)			50.00%
Performance share units | Distribution first | Units awarded during period
Share-based compensation (Textual) [Abstract]
Restricted stock (in shares)			84,734
Fair value grant (in dollars per share)			$ 26.09
Performance share units | Minimum
Share-based compensation (Textual) [Abstract]
Percentage adjustment of award determined by pre-tax return on capital (as a percent)			0.00%
Performance share units | Maximum
Share-based compensation (Textual) [Abstract]
Percentage adjustment of award determined by pre-tax return on capital (as a percent)			200.00%