Earnings Per Share Earnings Per Share (Details) - $ / shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Document Period End Date			Jun. 30, 2017
Document Fiscal Year Focus			2017
Basic weighted average shares outstanding	84.0	93.9	84.9	95.1
Diluted	$ 0.04	$ 0.38	$ (1.22)	$ (0.16)
Basic	$ 0.04	$ 0.39	$ (1.22)	$ (0.16)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			0.8	0.8
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.7	0.2	1.3	1.5