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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Long-term Debt - Unsecured Convertible Notes, and Covenants (Details)		1 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) shares	May 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	May 19, 2020 USD ($)	May 14, 2020 $ / shares	Dec. 31, 2019	Jan. 19, 2017 USD ($)
Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Threshold percentage of stock price		130.00%
Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Threshold percentage of stock price		98.00%
Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Threshold percentage of stock price		100.00%
Senior notes \| 5.625% Notes due 2027
Debt Instrument [Line Items]
Principal							$ 400,000,000.0
Interest rate			5.625%			5.625%	5.625%
Senior notes \| 2.75% Convertible Notes due 2026 \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Debt Instrument, convertible, conversion ratio		0.042735
Senior notes \| 2.75% Convertible Notes due 2026 \| Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Debt Instrument, convertible, conversion ratio		0.0555555
Convertible Notes \| 2.75% Convertible Notes due 2026
Debt Instrument [Line Items]
Principal				$ 330,500,000
Interest rate			2.75%	2.75%
Proceeds from issuance of long-term debt, net of discounts		$ 322,200,000
Conversion price (in dollars per share) \| $ / shares					$ 23.40
Number of shares issued upon conversion (in shares) \| shares	18,360,815
Amount if-converted value exceeds its principal amount	$ 1,255,300,000
Carrying amount of equity component		91,800,000	$ 88,200,000
Debt issuance costs		10,200,000
Effective yield			9.23%
Remaining period over which unamortized discount will be amortized			5 years 4 months 24 days
Convertible Notes \| Convertible Notes Due 2026, Liability Component
Debt Instrument [Line Items]
Debt issuance costs		6,600,000
Convertible Notes \| Convertible Notes Due 2026, Equity Component
Debt Instrument [Line Items]
Debt issuance costs		$ 3,600,000