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Recently Issued and Adopted Accounting Pronouncements and Regulatory Items Narrative (Details) - USD ($) $ in Millions	Jan. 01, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax effects reclassified from AOCI to retained earnings	$ 53.1
Lease asset		$ 147.3	$ 164.7
Present value of lease liabilities		176.7
Reclassification of prepaid rent, accrued rent and lease incentives		(380.8)	(487.5)
Adoption of accounting standards (Note 2)		2,984.2	2,561.4	$ 3,210.4	$ 2,707.1
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of accounting standards (Note 2)				2.4
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of accounting standards (Note 2)		$ 4,506.4	$ 4,188.8	4,334.3	$ 3,952.4
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of accounting standards (Note 2)				$ 55.5
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease asset	185.3
Present value of lease liabilities	215.9
Reclassification of prepaid rent, accrued rent and lease incentives	30.6
Accounting Standards Update 2016-02 | Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adoption of accounting standards (Note 2)	$ 2.4

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