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Earnings Per Share ("EPS") (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Net income $ 21.2 $ 248.3 $ 44.5 $ 279.1
Weighted average shares for basic EPS 137.5 120.0 137.3 112.3
Dilutive potential shares from grants of RSUs, PRSUs and stock options 0.4 [1] 0.7 [1] 0.5 [1] 0.5
Weighted average shares for diluted EPS 137.9 120.7 137.8 112.8
Antidilutive securities excluded from computation of earnings per share 0.6 0.1 0.1 0.1
[1] The potential impact of an aggregate 0.6 million granted RSUs, PRSUs and stock options for the three months ended September 30, 2015, and an aggregate 0.1 million granted RSUs, PRSUs and stock options for the nine months ended September 30, 2015, were antidilutive. The potential impact of an aggregate 0.1 million granted RSUs, PRSUs and stock options for each of the three and nine months ended September 30, 2014, were antidilutive.