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Earnings Per Share ("EPS") (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share [Abstract]        
Net income $ 22.2 $ 22.4 $ 23.3 $ 30.8
Weighted average shares for basic EPS 137.4 119.7 137.1 108.4
Dilutive potential shares from grants of RSUs, PRSUs and stock options 0.4 [1] 0.2 [1] 0.5 [1] 0.2
Weighted average shares for diluted EPS 137.8 119.9 137.6 108.6
Antidilutive securities excluded from computation of earnings per share 0.2   0.1  
[1] The potential impact of an aggregate 0.2 million granted RSUs, PRSUs and stock options for the three months ended June 30, 2015, and an aggregate 0.1 million granted RSUs, PRSUs and stock options for the six months ended June 30, 2015, were antidilutive.