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Earnings Per Share (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net income $ 248.3 $ 37.2 $ 279.1 $ 93.5
Weighted average shares for basic EPS 120.0 120.0 112.3 112.3
Dilutive potential shares from granted RSUs and PRSUs 0.7 [1] 0.7 [1] 0.5 [1] 0.5 [1]
Weighted average shares for diluted EPS 120.7 120.7 112.8 112.8
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0.1   0.1  
[1] The potential impact of an aggregate 0.1 million granted RSUs, PRSUs and stock options for each of the three months and nine months ended September 30, 2014, was antidilutive.