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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Share-Based Compensation Expense

Stock-based compensation expense by award type is presented below.

			Year Ended December 31,
(in millions)			2020			2019			2018
Restricted stock unit awards			$	41.8		61.6			22.4
Performance stock unit awards			5.5			13.6			3.2
SAYE			0.2			1.2			1.3
Total			$	47.5		76.4			26.9

Restricted Stock Unit and Performance Stock Unit Activity

			RSU Shares (in 000's)			PSU Shares (in 000's)						Total Shares (in 000's)						Weighted Average Grant Date Fair Value			Weighted Average Remaining Contractual Life (in years)
Unvested as of December 31, 2017			727.7			—						727.7						$	118.96		1.24
Granted			176.6			100.6						277.2						156.13
Vested			(292.5)			—						(292.5)						125.01
Forfeited			(52.2)			(7.5)						(59.7)						131.84
Unvested as of December 31, 2018			559.6			93.1						652.7						131.32			2.02
Granted			1,298.0			196.5						1,494.5						141.06
Vested			(287.7)			—						(287.7)						116.32
Forfeited			(37.6)			(2.8)						(40.4)						137.49
Unvested as of December 31, 2019			1,532.3			286.8						1,819.1						141.51			2.39
Granted			173.1			276.4						449.5						124.98
Vested			(571.1)			—						(571.1)						137.99
Forfeited			(38.1)			(31.7)						(69.8)						136.00
Unvested as of December 31, 2020			1,096.2			531.5						1,627.7						$	137.42		1.69

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Schedule of Share-based Compensation, Restricted and Performance Stock Units Award Activity [Table Text Block]

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

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