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Long-Term Debt - Components of Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2020	Aug. 03, 2020	Jun. 12, 2020	Dec. 31, 2019
Long-Term Debt
Long-term debt principal	$ 4,311.5			$ 3,763.2
Net unamortized discount, premium and debt issuance costs	(32.5)			(29.1)
Long-term debt carrying amount	$ 4,279.0			$ 3,734.1
3.3% notes payable, due 2022
Long-Term Debt
Interest rate (as a percent)	3.30%			3.30%
Long-term debt principal	$ 300.0			$ 300.0
Net unamortized discount, premium and debt issuance costs	(0.7)			(1.0)
Long-term debt carrying amount	$ 299.3			$ 299.0
3.125% notes payable, due 2023
Long-Term Debt
Interest rate (as a percent)	3.125%			3.125%
Long-term debt principal	$ 300.0			$ 300.0
Net unamortized discount, premium and debt issuance costs	(0.7)			(1.0)
Long-term debt carrying amount	$ 299.3			$ 299.0
3.4% notes payable, due 2025
Long-Term Debt
Interest rate (as a percent)	3.40%			3.40%
Long-term debt principal	$ 400.0			$ 400.0
Net unamortized discount, premium and debt issuance costs	(2.2)			(2.6)
Long-term debt carrying amount	$ 397.8			$ 397.4
3.1% notes payable, due 2026
Long-Term Debt
Interest rate (as a percent)	3.10%			3.10%
Long-term debt principal	$ 350.0			$ 350.0
Net unamortized discount, premium and debt issuance costs	(2.2)			(2.5)
Long-term debt carrying amount	$ 347.8			$ 347.5
3.7% notes payable, due 2029
Long-Term Debt
Interest rate (as a percent)	3.70%			3.70%
Long-term debt principal	$ 500.0			$ 500.0
Net unamortized discount, premium and debt issuance costs	(5.7)			(6.1)
Long-term debt carrying amount	$ 494.3			$ 493.9
2.125% notes payable, due 2030
Long-Term Debt
Interest rate (as a percent)	2.125%
Long-term debt principal	$ 600.0
Net unamortized discount, premium and debt issuance costs	(4.8)
Long-term debt carrying amount	$ 595.2
2.125% notes payable, due 2030 | Senior notes
Long-Term Debt
Interest rate (as a percent)		2.125%	2.125%
Long-term debt issued		$ 100.0	$ 500.0
6.05% notes payable, due 2036
Long-Term Debt
Interest rate (as a percent)	6.05%			6.05%
Long-term debt principal	$ 505.6			$ 505.6
Net unamortized discount, premium and debt issuance costs	(2.5)			(2.4)
Long-term debt carrying amount	$ 503.1			$ 503.2
4.625% notes payable, due 2042
Long-Term Debt
Interest rate (as a percent)	4.625%			4.625%
Long-term debt principal	$ 300.0			$ 300.0
Net unamortized discount, premium and debt issuance costs	(3.2)			(3.2)
Long-term debt carrying amount	$ 296.8			$ 296.8
4.35% notes payable, due 2043
Long-Term Debt
Interest rate (as a percent)	4.35%			4.35%
Long-term debt principal	$ 300.0			$ 300.0
Net unamortized discount, premium and debt issuance costs	(3.1)			(3.3)
Long-term debt carrying amount	$ 296.9			$ 296.7
4.3% notes payable, due 2046
Long-Term Debt
Interest rate (as a percent)	4.30%			4.30%
Long-term debt principal	$ 300.0			$ 300.0
Net unamortized discount, premium and debt issuance costs	(3.2)			(3.3)
Long-term debt carrying amount	$ 296.8			$ 296.7
4.7% notes payable, due 2055
Long-Term Debt
Interest rate (as a percent)	4.70%			4.70%
Long-term debt principal	$ 400.0			$ 400.0
Net unamortized discount, premium and debt issuance costs	(4.8)			(4.9)
Long-term debt carrying amount	395.2			395.1
Non-recourse mortgages and notes payable
Long-Term Debt
Long-term debt principal	55.9			107.6
Net unamortized discount, premium and debt issuance costs	0.6			1.2
Long-term debt carrying amount	$ 56.5			$ 108.8

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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