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Property and Equipment Property and Equipment (Schedule of Property and Equipment) (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($) $ / bbl	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) $ / bbl
Property, Plant and Equipment [Line Items]
PROPERTY AND EQUIPMENT, AT COST	$ 14,461.9		$ 18,393.8
Oil and Gas, Average Sale Price | $ / bbl	20		60
Asset Impairment Charges	$ 2,808.2	$ 0.0
Assets, Fair Value Disclosure	72.3
Drilling rigs and equipment
Property, Plant and Equipment [Line Items]
PROPERTY AND EQUIPMENT, AT COST	13,792.0		$ 17,714.0
Work-in-progress
Property, Plant and Equipment [Line Items]
PROPERTY AND EQUIPMENT, AT COST	482.4		473.6
Other
Property, Plant and Equipment [Line Items]
PROPERTY AND EQUIPMENT, AT COST	$ 187.5		$ 206.2

X

- Definition

Sales price per unit of oil and gas produced.

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