The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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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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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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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Price of a single share of a number of saleable stocks of a company.

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Debt, Net - Convertible Notes (Details)	6 Months Ended
Debt, Net - Convertible Notes (Details)	Jun. 30, 2019 $ / shares	Jul. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2014 USD ($)	Jul. 31, 2013 USD ($)
Convertible Notes \| 2020 Convertible Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	3.00%				3.00%
Initial conversion price (USD per share)	$ 45.72
Closing stock price at date of issuance (in dollars per share)	$ 33.35
Conversion rate (shares per $1,000 principal amount)	0.0219
Convertible Notes \| 2021 Convertible Notes
Debt Instrument [Line Items]
Debt issued \| $				$ 161,000,000.0
Stated interest rate (as a percent)	2.875%			2.875%
Initial conversion price (USD per share)	$ 59.39
Closing stock price at date of issuance (in dollars per share)	$ 47.51
Conversion rate (shares per $1,000 principal amount)	0.0168
Convertible Notes \| 2022 Convertible Notes
Debt Instrument [Line Items]
Debt issued \| $			$ 150,000,000.0
Stated interest rate (as a percent)	3.25%		3.25%
Initial conversion price (USD per share)	$ 45.57
Closing stock price at date of issuance (in dollars per share)	$ 35.05
Conversion rate (shares per $1,000 principal amount)	0.0219
Convertible Notes \| 2023 Exchangeable Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	4.50%
Initial conversion price (USD per share)	$ 44.62
Closing stock price at date of issuance (in dollars per share)	$ 36.45
Conversion rate (shares per $1,000 principal amount)	0.0224
Encore Finance \| Convertible Notes \| 2020 Convertible Notes
Debt Instrument [Line Items]
Debt issued \| $					$ 172,500,000
Encore Finance \| Term Loan Facility \| 2023 Exchangeable Notes
Debt Instrument [Line Items]
Debt issued \| $		$ 172,500,000
Stated interest rate (as a percent)		4.50%
Subsidiaries \| Encore Finance
Debt Instrument [Line Items]
Ownership interest (as a percent)		100.00%