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Debt (Schedule of Extinguishment of Debt - Tender and OMR) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Oct. 01, 2016
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount		$ 24.5
Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 1,130.6	$ 24.5
Debt Instrument, Repurchase Amount	$ 863.9
Discount on Principal	23.60%
Senior Notes [Member] | 8.50% Senior notes due 2019
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 62.0
Debt Instrument, Repurchase Amount	$ 55.7
Discount on Principal	10.20%
Senior Notes [Member] | 6.875% Senior notes due 2020
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 219.2
Debt Instrument, Repurchase Amount	$ 181.5
Discount on Principal	17.20%
Senior Notes [Member] | 4.70% Senior notes due 2021
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 817.0
Debt Instrument, Repurchase Amount	$ 609.0
Discount on Principal	25.50%
Senior Notes [Member] | 4.50% Senior notes due 2024
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 1.7
Debt Instrument, Repurchase Amount	$ 0.9
Discount on Principal	47.10%
Senior Notes [Member] | 5.20% Senior notes due 2025
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 30.7
Debt Instrument, Repurchase Amount	$ 16.8
Discount on Principal	45.30%

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Discount on Principal

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- Definition

Fair value amount of debt instrument that was repurchased.

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- Definition

Face (par) amount of the original debt instrument that was repurchased.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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