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Statements Of Consolidated Cash Flows (Supplemental Disclosures of Cash Flow Information) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Capital expenditures included in current liabilities		$ 193.0	$ 167.7
Dividends declared but not paid		94.4	88.5
Purchase contract liability, net of fees and payments(1)	[1]	161.5	0.0
Assets recorded for asset retirement obligations		0.0	70.3
Obligation to developer at formation of joint venture		$ 6.0	$ 0.0
[1] Refer to Note 5, "Equity," for additional information.

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Obligation to the Developer

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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