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Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	$ 94.5	$ 31.7	$ 149.5	$ 42.0
Weighted average common shares outstanding - basic	144.5	143.4	144.3	143.1
Dilutive effect of stock warrants	0.0	0.2	0.0	0.3
Dilutive effect of employee stock plans	1.7	1.6	1.7	1.7
Dilutive potential common shares	1.7	1.8	1.7	2.0
Weighted average shares outstanding - diluted	146.2	145.2	146.0	145.1
Net income per share of common stock:
Net income per share - basic	$ 0.65	$ 0.22	$ 1.04	$ 0.29
Net income per share - diluted	$ 0.65	$ 0.22	$ 1.02	$ 0.29

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