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Debt (Schedule of Extinguishment of Debt - Tender and OMR) (Details) - Senior Notes [Member] - USD ($) $ in Millions	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 194.1		$ 1,130.6
Debt Instrument, Repurchase Amount	204.5		863.9
8.50% Senior notes due 2019
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	54.6	$ 145.8	62.0
Debt Instrument, Repurchase Amount	60.1		55.7
6.875% Senior notes due 2020
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	100.1	129.8	219.2
Debt Instrument, Repurchase Amount	105.1		181.5
4.70% Senior notes due 2021
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	39.4	$ 373.9	817.0
Debt Instrument, Repurchase Amount	$ 39.3		609.0
4.50% Senior notes due 2024
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount			1.7
Debt Instrument, Repurchase Amount			0.9
5.20% Senior notes due 2025
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount			30.7
Debt Instrument, Repurchase Amount			$ 16.8

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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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