Share-Based Compensation and Stock Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model
Expected annual dividend rate (as a percent)	1.08%
Risk-free interest rate (as a percent)	1.53%
Average expected life (years)	5 years 8 months 12 days
Expected volatility of common stock (as a percent)	0.401%
Forfeiture rate (as a percent)	0.00%
Weighted average fair value of option grants	$ 5.22
Stock based compensation expense	$ 3.9	$ 2.8
Common stock repurchased (in shares)	0	1,250,000
Common stock repurchased, value		$ 18.7
Employee Stock Option | Long Term Incentive Plan 2010
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model
Options granted (in shares)	206,021
Restricted Stock Units (RSUs)
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model
Granted (in dollars per share)	$ 14.84
Restricted Stock Units (RSUs) | Long Term Incentive Plan 2010
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model
Granted (in shares)	380,197
Vesting period	3 years
Performance Share Units | Long Term Incentive Plan 2010
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model
Granted (in shares)	183,416
Vesting period	3 years
Director | Restricted Stock Units (RSUs)
Assumptions used to determine value of the shares purchased under the stock purchase plan using Black-Scholes option pricing model
Granted (in shares)	42,624