Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Subsequent Events (Details) - USD ($) $ in Millions	Jul. 06, 2020	Jun. 27, 2020
Subsequent Event
Subsequent Event [Line Items]
Loss on extinguishment of debt	$ 19.0
3.500% Unsecured Senior notes due March 15, 2021
Subsequent Event [Line Items]
Interest rate, stated percentage		3.50%
3.500% Unsecured Senior notes due March 15, 2021 \| Subsequent Event
Subsequent Event [Line Items]
Redemption of senior notes	$ 280.4
Interest rate, stated percentage	3.50%
3.500% Senior note due December 15, 2021
Subsequent Event [Line Items]
Interest rate, stated percentage		3.50%
3.500% Senior note due December 15, 2021 \| Subsequent Event
Subsequent Event [Line Items]
Redemption of senior notes	$ 309.6
Interest rate, stated percentage	3.50%