Capital Stock, Accumulated Other Comprehensive Loss and Equity - Schedule of Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended			96 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items]
Aggregate Repurchases	$ 705.2	$ 454.4	$ 658.8
Cash paid for Repurchases	$ 704.9	$ 450.5	$ 658.8	$ 4,200.0
Number of Shares	4,308,418	3,014,131	5,816,363
Average Price per Share (in dollars per share)	$ 163.69	$ 150.77	$ 113.26	$ 87.20
Purchases prior to the increased authorization
Equity, Class of Treasury Stock [Line Items]
Aggregate Repurchases	$ 5.1