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Stock-Based Compensation	6 Months Ended
Stock-Based Compensation	Jun. 30, 2015
Stock-Based Compensation [Abstract]
Stock-Based Compensation	Stock-Based Compensation. We recognized $2.8 million and $2.0 million in pre-tax compensation expense related to stock options and restricted stock units during the three-month periods ended June 30, 2015 and 2014, respectively, and $5.0 million and $3.5 million during the six-month periods ended June 30, 2015 and 2014. During the six months ended June 30, 2015, we granted approximately 524,000 stock options, 419,000 performance-based restricted stock units and 163,000 time-vesting restricted stock units. The stock options granted were valued using a Black-Scholes pricing model with the following assumptions: an expected volatility of 30.55% to 40.68%, a risk-free interest rate of 0.98% to 1.76%, an expected dividend yield of 2.6% to 3.5% and an expected life of 3.50 to 9.25 years. The weighted-average exercise price of the options granted during the six months ended June 30, 2015, was $30.10 and the weighted-average grant-date fair value was $6.95. Performance-based restricted stock units are valued using a Monte Carlo simulation. Time-vesting restricted stock units are valued using the closing price on the trading day immediately preceding the day of the grant, adjusted for any provisions affecting fair value, such as the lack of dividends or dividend equivalents during the vesting period. The weighted-average grant date fair value of the restricted stock units granted during the six months ended June 30, 2015, was $27.85.