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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
Numerator
Net income	$ 78.4	$ 61.1
Less: Net income attributable to participating securities	(1.9)	(1.4)
Net income attributable to common shareholders - Basic and Dilutive	$ 76.5	$ 59.7
Denominators
Basic - Weighted-average shares outstanding	78.5	77.9
Basic - Less: Participating securities	(1.9)	(1.7)
Basic - Weighted-average common shares outstanding	76.6	76.2
Effect of dilutive securities - dilutive stock-based compensation	0.4	0.3
Diluted - Adjusted weighted-average shares after assumed conversions	77.0	76.5
Basic EPS	$ 1.00	$ 0.78
Diluted EPS	$ 0.99	$ 0.78

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