Fair Value of Assets & Liabilities - Narrative (Details) - Corporate $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($)
Disposition of Acquired Properties
Segment Reporting Information [Line Items]
Asset impairment charges	$ 4.6
Reversed asset impairment charges	0.7
Disposition of Acquired Properties \| 2019 Business Optimization
Segment Reporting Information [Line Items]
Asset impairment charges	1.5
Leased Assets \| 2019 Business Optimization
Segment Reporting Information [Line Items]
Asset impairment charges	14.0
Reversed asset impairment charges	1.4
Leased Assets \| Rebranding Initiative
Segment Reporting Information [Line Items]
Asset impairment charges	$ 7.1

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: 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=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

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