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Debt (Schedule Of Long-Term Debt Instruments) (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2016	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015	Mar. 31, 2018	Mar. 31, 2017
Debt Instrument [Line Items]
Debt Instrument Carrying Value				$ 5,010.4	$ 4,750.7
Long-term Debt, Excluding Current Maturities				5,010.4	4,750.7
8.50% Senior notes due 2019(1)
Debt Instrument [Line Items]
Debt Instrument Carrying Value				$ 0.0	$ 251.4
Debt instrument, interest rate, stated percentage				8.50%
Senior Note Maturity Year				2019
8.50% Senior notes due 2019(1) | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			8.50%
Senior Note Maturity Year			2019		2019
6.875% Senior notes due 2020(1)
Debt Instrument [Line Items]
Debt Instrument Carrying Value				$ 127.5	$ 477.9
Debt instrument, interest rate, stated percentage				6.875%
Senior Note Maturity Year				2020
6.875% Senior notes due 2020(1) | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			6.875%
Senior Note Maturity Year		2020	2020
4.70% Senior notes due 2021(1)
Debt Instrument [Line Items]
Debt Instrument Carrying Value				$ 112.7	267.1
Debt instrument, interest rate, stated percentage				4.70%
Senior Note Maturity Year				2021
4.70% Senior notes due 2021(1) | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			4.70%
Senior Note Maturity Year		2021	2021
3.00% Exchangeable senior notes due 2024(2)
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				3.00%
Senior Note Maturity Year				2024
3.00% Exchangeable senior notes due 2024(2) | Convertible Debt [Member]
Debt Instrument [Line Items]
Debt Instrument Carrying Value				$ 666.8	635.7
Debt instrument, interest rate, stated percentage				8.00%
Senior Note Maturity Year				2024
3.00% exchangeable senior notes, excluding discount and net of debt issuance costs				$ 836.3	834.0
4.50% Senior notes due 2024
Debt Instrument [Line Items]
Debt Instrument Carrying Value				$ 619.8	619.3
Debt instrument, interest rate, stated percentage				4.50%
Senior Note Maturity Year				2024
4.50% Senior notes due 2024 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage						4.50%
Senior Note Maturity Year						2024
8.00% Senior notes due 2024
Debt Instrument [Line Items]
Debt Instrument Carrying Value				$ 337.0	$ 337.9
Debt instrument, interest rate, stated percentage				8.00%
Senior Note Maturity Year				2024
8.00% Senior notes due 2024 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				8.00%	8.00%
Senior Note Maturity Year				2024	2024
5.20% Senior notes due 2025
Debt Instrument [Line Items]
Debt Instrument Carrying Value				$ 664.4	$ 663.6
Debt instrument, interest rate, stated percentage				5.20%
Senior Note Maturity Year				2025
5.20% Senior notes due 2025 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				5.20%
Senior Note Maturity Year				2025
7.75% Senior notes due 2026
Debt Instrument [Line Items]
Debt Instrument Carrying Value				$ 985.0	0.0
7.75% Senior notes due 2026 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage							7.75%
7.20% Senior notes due 2027
Debt Instrument [Line Items]
Debt Instrument Carrying Value				$ 149.3	$ 149.3
Debt instrument, interest rate, stated percentage				7.20%
Senior Note Maturity Year				2027
7.20% Senior notes due 2027 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage					7.20%
7.875% Senior notes due 2040
Debt Instrument [Line Items]
Debt Instrument Carrying Value				$ 375.0	$ 376.7
Debt instrument, interest rate, stated percentage				7.875%
Senior Note Maturity Year				2040
7.875% Senior notes due 2040 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			7.875%
Senior Note Maturity Year			2040
5.75% Senior notes due 2044
Debt Instrument [Line Items]
Debt Instrument Carrying Value				$ 972.9	$ 971.8
Debt instrument, interest rate, stated percentage				5.75%
Senior Note Maturity Year				2044
5.75% Senior notes due 2044 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage						5.75%		5.75%
Senior Note Maturity Year	2044					2044

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 10
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