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Debt and Credit Arrangements - 2024 Notes Narratives (Details) $ / shares in Units, shares in Thousands		1 Months Ended	9 Months Ended
	Nov. 06, 2017 USD ($)	Dec. 31, 2017 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) day $ / shares	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Oct. 31, 2017 $ / shares
Debt Instrument
Share price (CAD per share) | $ / shares			$ 191.11			$ 43.50
Convertible Debt | Convertible Notes, due 2024
Debt Instrument
Debt instrument stated interest rate (percent)	1.00%
Debt instrument face amount	$ 258,800,000		$ 258,800,000	$ 258,800,000	$ 258,800,000
Share conversion rate (per share)	0.0170285
Debt instrument, conversion price (usd per share) | $ / shares			$ 76.3425			$ 58.725
Debt instrument, conversion premium						35.00%
Value of securities above principal amount of debt if converted			$ 583,400,000
Debt instrument, threshold for consecutive trading days | day			20
Debt instrument, threshold for consecutive trading days | day			30
Applicable conversion price threshold (as percentage)			130.00%
Maximum days after five trading days			5 days
Applicable conversion price, less than (as percentage)			97.00%
Debt instrument effective interest rate	4.80%
Non cash payment for derivative instrument		$ 59,500,000
Number of shares underlying warrant | shares		4,410
Proceeds from issuances of warrants		$ 46,000,000.0
Percentage above previous sales price						65.00%
Net cost of convertible note hedge and warrant			$ 13,500,000
Convertible Debt | Convertible Notes, due 2024 | Maximum
Debt Instrument
Debt instrument, conversion price (usd per share) | $ / shares		$ 71.775
Convertible Debt | Convertible Notes, due 2024 | Liability Component
Debt Instrument
Debt instrument face amount	$ 200,100,000
Debt issuance costs	5,300,000
Convertible Debt | Convertible Notes, due 2024 | Equity Component
Debt Instrument
Debt instrument face amount	58,700,000
Debt issuance costs	$ 1,500,000

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