Stock Based Compensation - Stock Based Compensation (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	$ 50.8	$ 44.2	$ 40.7
Income tax benefit	(10.5)	(14.4)	(13.5)
Total stock-based compensation expense	40.3	29.8	27.2
Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	30.5	26.9	25.4
Income tax benefit	(6.3)	(8.7)	(8.4)
Total stock-based compensation expense	24.2	18.2	17.0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pretax compensation expense	20.3	17.3	15.3
Income tax benefit	(4.2)	(5.7)	(5.1)
Total stock-based compensation expense	$ 16.1	$ 11.6	$ 10.2

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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