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Debt - Senior Secured Second Priority Notes (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Jul. 09, 2019	Dec. 31, 2018	Jun. 30, 2016
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt	$ 51.0	$ 53.6	$ 5.4
Payment for Debt Extinguishment or Debt Prepayment Cost	41.5	$ 41.5	$ 3.7
Write off of Deferred Debt Issuance Cost	$ 9.5
2027 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		100.00%
2027 Notes [Member] | Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		105.50%
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed		40.00%
2027 Notes [Member] | Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		102.75%
2027 Notes [Member] | Debt Instrument, Redemption, Period Three [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		101.833%
2027 Notes [Member] | Debt Instrument, Redemption, Period Four [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		100.917%
2027 Notes [Member] | Debt Instrument, Redemption, Period Five [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		100.00%
2027 Notes [Member] | Debt Instrument, Redemption, Period Six [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		101.00%
2027 Notes [Member] | Debt Instrument, Redemption, Period Seven [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		100.00%
Senior Notes [Member] | 2022 Notes
Debt Instrument [Line Items]
Aggregate principal amount						$ 610.0
Debt Instrument, Interest Rate, Stated Percentage	7.50%	7.50%
Aggregate principal amount redeemed	$ 183.0	$ 183.0		$ 427.0
Debt, gross	$ 0.0	$ 0.0			$ 427.0
Senior Notes [Member] | 2027 Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	5.50%	5.50%
Debt, gross	$ 1,200.0	$ 1,200.0			0.0
Senior Notes [Member] | 2024 Notes
Debt Instrument [Line Items]
Aggregate principal amount						$ 625.0
Debt Instrument, Interest Rate, Stated Percentage	7.75%	7.75%
Aggregate principal amount redeemed	$ 187.5	$ 187.5		$ 437.5
Debt, gross	$ 0.0	$ 0.0			$ 437.5

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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