Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02(29))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Name:	us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Subsequent Event (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended
	May 06, 2020	Mar. 31, 2020	Mar. 31, 2019
Subsequent Event [Line Items]
Stock repurchased in the period, value		$ 899.9	$ 56.2
Repurchase Program [Member]
Subsequent Event [Line Items]
Stock repurchased in the period, shares		10.0
Stock repurchased in the period, value		$ 899.9
Subsequent Event [Member] \| Repurchase Program [Member]
Subsequent Event [Line Items]
Stock repurchased in the period, shares	1.5
Stock repurchased in the period, value	$ 146.1