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Debt Debt (Narrative) (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) $ / shares	Mar. 31, 2019 USD ($)	Dec. 31, 2019
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt	$ 3.1	$ 0.0
Letters of credit outstanding, amount	$ 117.9
7.38% Senior notes due 2025
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.875%		7.875%
Senior note, maturity year	2040
4.875% Senior Notes Due 2022 Member [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.58%		4.58%
4.75% Senior Notes Due 2024 Member [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%		4.75%
7.38% Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.38%		7.38%
5.40%SeniorNotesDue2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.40%		5.40%
5.85%SeniorNotesDue2044 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.85%		5.85%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,300.0
Line of Credit Facility, Fair Value of Amount Outstanding	332.1
Letters of credit outstanding, amount	3.2
Senior Notes | 7.38% Senior notes due 2025
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 201.4
Debt Instrument, Interest Rate, Stated Percentage	7.875%
Senior Notes | 4.875% Senior Notes Due 2022 Member [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 620.8
Debt Instrument, Interest Rate, Stated Percentage	4.875%
Senior Notes | 4.75% Senior Notes Due 2024 Member [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 398.1
Debt Instrument, Interest Rate, Stated Percentage	4.75%
Senior Notes | 7.38% Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500.0
Debt Instrument, Interest Rate, Stated Percentage	7.375%
Senior Notes | 5.40%SeniorNotesDue2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 400.0
Debt Instrument, Interest Rate, Stated Percentage	5.40%
Senior Notes | 5.85%SeniorNotesDue2044 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 400.0
Debt Instrument, Interest Rate, Stated Percentage	5.85%
Senior Notes | Rowan Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 2,100.0
Convertible Debt [Member] | Three Percent Exchangeable Senior Notes Due Two Thousand Twenty Four [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 849.5
Debt Instrument, Convertible, Conversion Ratio	17.8336
Debt Instrument, Convertible, Conversion Price | $ / shares	$ 56.08

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