Senior Notes Payable and Other Debt - Derivatives and Hedging (Details) - Dec. 31, 2020 - Swap $ in Millions, $ in Millions	USD ($)	CAD ($)
Variable Rate Debt
Derivative [Line Items]
Variable rate debt amount	$ 1,500.0
Derivative, Notional Amount	146.7
Fixed Rate Debt
Derivative [Line Items]
Variable rate debt amount	10,500.0
Derivative, Notional Amount	$ 305.9	$ 145.7

Nominal or face amount used to calculate payment on derivative.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant