Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effective income tax rate on continuing operations (as a percent)		32.30%	32.60%
Anticipated effective tax rate for beginning of year to date (as a percent)		34.40%
Discrete tax expense (benefit) related to state valuation allowance release		$ 5.1	$ 1.1
Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Discrete income tax benefit	$ 0.9	$ 3.5