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Derivative Instruments (Narrative) (Details) $ / shares in Units, $ in Millions		1 Months Ended	12 Months Ended			13 Months Ended
	Sep. 15, 2015 USD ($)	Sep. 30, 2010 USD ($) counterparties $ / shares shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 $ / shares shares	Dec. 31, 2016 USD ($) shares
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative collateral			$ 1,600.0	$ 827.8		$ 827.8
Credit risk, maximum exposure			11.9	$ 55.5
Collateral on deposit			$ 0.5
Derivative [Line Items]
Shares of common stock issued to settle warrants that have reached their expiration | shares				92,998	47,868	140,866
Call Options [Member]
Derivative [Line Items]
Derivative, term of contract			1 year
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, term of contract			7 years
Interest Rate Caps [Member]
Derivative [Line Items]
Derivative, term of contract			7 years
2015 Notes Hedges [Member]
Derivative [Line Items]
Number of counterparties | counterparties		2
Conversion spread, shares of common stock | shares		16,000,000
Derivative asset, strike price | $ / shares		$ 12.50
Derivative asset, cash received to settle	$ 25.8
2015 Notes Embedded Conversion Derivative [Member]
Derivative [Line Items]
Derivative liability, cash paid to settle conversion premium	$ 25.8
2015 Warrants [Member]
Derivative [Line Items]
Number of securities called by warrants | shares		16,000,000			1,600,000
Warrants, exercise price | $ / shares		$ 16.00			$ 15.59
Proceeds from issuance of warrants		$ 15.6
September 2015 Notes [Member]
Derivative [Line Items]
Debt instrument, face amount		$ 200.0
Interest rate		3.50%
Three Month London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Caps [Member]
Derivative [Line Items]
Cap rate			2.50%

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The amount of cash received at maturity to settle the derivative asset.

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The price per share that we will be entitled to receive if we opt to exercise the call options of the 2015 notes hedge.

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Number of shares that is the basis for the amount of cash that we are entitled to if we exercise the call options in the 2015 notes hedge.

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The amount of cash paid to settle the conversion premium of convertible senior notes which was accounted for as an embedded conversion derivative liability.

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Exercise price of the warrants.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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-SubTopic 10
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Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

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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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Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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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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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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Number of shares of stock issued attributable to transactions classified as other.

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