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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 0.2 0.2
Earnings available to common stockholders $ 62.3 $ 12.6
Weighted average basic shares outstanding 182.7 182.4
Earnings per share - basic $ 0.34 $ 0.07
Earnings available to common shareholders, diluted $ 62.3 $ 12.6
Dilutive impact of stock based awards 7.6 1.6
Weighted average dilutive shares outstanding 190.3 184.0
Earnings per share - diluted $ 0.33 $ 0.07
Performance Shares [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share, amount 0.3 6.5