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Debt Debt (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Gain on extinguishment of debt	$ 0.0	$ 194.1	$ 3.1	$ 194.1
Loss on impairment	0.0	$ 88.2	3,646.2	$ 90.7
Letters of credit outstanding, amount	$ 123.1		$ 123.1
7.38% Senior notes due 2025
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	787.50%		787.50%
4.875% Senior Notes Due 2022 Member [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	487.50%		487.50%
4.75% Senior Notes Due 2024 Member [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 398.1		$ 398.1
Debt Instrument, Interest Rate, Stated Percentage	475.00%		475.00%
7.38% Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	737.50%		737.50%
5.40%SeniorNotesDue2042 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 400.0		$ 400.0
Debt Instrument, Interest Rate, Stated Percentage	540.00%		540.00%
5.85%SeniorNotesDue2044 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 400.0		$ 400.0
Debt Instrument, Interest Rate, Stated Percentage	585.00%		585.00%
8.00% senior notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	800.00%		800.00%
Seven Point Eight Seven Five Percent Senior Notes Member [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 201.4		$ 201.4
4.875% Senior notes due 2022
Debt Instrument [Line Items]
Debt Instrument, Face Amount	620.8		620.8
7.375% Senior notes due 2025
Debt Instrument [Line Items]
Debt Instrument, Face Amount	500.0		500.0
Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding	581.0		581.0
Letters of credit outstanding, amount	$ 41.2		$ 41.2
Senior Notes | 4.75% Senior Notes Due 2024 Member [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	4.75%		4.75%
Senior Notes | 5.85%SeniorNotesDue2044 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.85%		5.85%
Senior Notes | Seven Point Eight Seven Five Percent Senior Notes Member [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.875%		7.875%
Senior Notes | 4.875% Senior notes due 2022
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	487.50%		487.50%
Senior Notes | 7.375% Senior notes due 2025
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.375%		7.375%

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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