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Capital Stock, Accumulated Other Comprehensive Loss and Equity - Schedule of Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended			120 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Equity [Abstract]
Aggregate Repurchases	$ 70.0	$ 380.4	$ 705.2
Cash paid for Repurchases	$ 70.0	$ 384.7	$ 704.9	$ 4,700.0
Number of Shares	641,149	2,819,081	4,308,418
Average Price per Share (in dollars per share)	$ 109.22	$ 134.95	$ 163.69	$ 90.07

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The cash outflow to reacquire common stock during the period.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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