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Long-term Debt - Senior Unsecured Notes, Unsecured Convertible Notes, and Covenants (Details) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	May 31, 2020 USD ($) $ / shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)	Jul. 01, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jan. 19, 2017 USD ($)
Debt Instrument [Line Items]
(Decrease) increase from adoption		$ 3,596.6	$ 4,097.1		$ 2,655.8	$ 1,851.9
Additional Paid-In Capital
Debt Instrument [Line Items]
(Decrease) increase from adoption		$ 4,220.2	4,239.6		$ 3,167.2	1,718.3
Cumulative Effect, Period of Adoption, Adjustment
Debt Instrument [Line Items]
(Decrease) increase from adoption			(69.3)			$ 0.6
Cumulative Effect, Period of Adoption, Adjustment \| Additional Paid-In Capital
Debt Instrument [Line Items]
(Decrease) increase from adoption			$ (88.2)
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%
5.625% Notes due 2027 \| Senior notes
Debt Instrument [Line Items]
Debt principal amount							$ 400.0
Interest rate		5.625%	5.625%
4.125% Notes due 2029 \| Senior notes
Debt Instrument [Line Items]
Debt principal amount				$ 400.0
Interest rate		4.125%
2.75% Convertible Notes due 2026 \| Senior notes \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Debt Instrument, convertible, conversion ratio	0.042735
2.75% Convertible Notes due 2026 \| Senior notes \| Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Debt Instrument, convertible, conversion ratio	0.0555555
2.75% Convertible Notes due 2026 \| Convertible Notes
Debt Instrument [Line Items]
Debt principal amount		$ 330.5	$ 330.5
Interest rate		2.75%
Proceeds from issuance of long-term debt, net of discounts	$ 322.2
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		$ 214.8
Carrying amount of equity component	$ 91.8	$ 0.0	$ 88.2
Debt issuance costs	10.2
Effective yield		3.329%
Remaining term		3 years 4 months 24 days
Convertible Notes Due 2026, Liability Component \| Convertible Notes
Debt Instrument [Line Items]
Debt issuance costs	6.6
Convertible Notes Due 2026, Equity Component \| Convertible Notes
Debt Instrument [Line Items]
Debt issuance costs	$ 3.6