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Debt Schedule of Extinguishment of Debt - Open Market Repurchases (Details) - USD ($) $ in Millions	Jun. 30, 2017	Mar. 31, 2017
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchase Amount		$ 664.5
Senior Notes [Member] | Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	$ 194.1	649.5
Debt Instrument, Repurchase Amount	204.5
Senior Notes [Member] | 8.50% Senior notes due 2019 | Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	54.6	145.8
Debt Instrument, Repurchase Amount	60.1
Senior Notes [Member] | 6.875% Senior notes due 2020 | Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	100.1	129.8
Debt Instrument, Repurchase Amount	105.1
Senior Notes [Member] | 4.70% Senior notes due 2021 | Senior Notes [Member]
Extinguishment of Debt [Line Items]
Debt Instrument, Repurchased Face Amount	39.4	$ 373.9
Debt Instrument, Repurchase Amount	$ 39.3

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Fair value amount of debt instrument that was repurchased.

+ References

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- Definition

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- Definition

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