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Earnings per Share - Schedule of Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Subsidiary, Sale of Stock [Line Items]
Net income - basic	$ 68.5	$ 22.5	$ 65.5	$ 96.9
Net income - diluted	$ 68.5	$ 22.5	$ 65.5	$ 96.9
Weighted-average shares outstanding:
Basic (in shares)	95.8	94.7	95.6	94.5
Effect of dilutive securities:
Diluted (in shares)	99.0	97.7	98.3	97.9
Earnings per share, basic (in USD per share)	$ 0.72	$ 0.24	$ 0.69	$ 1.03
Earnings per share, diluted (in USD per share)	$ 0.69	$ 0.23	$ 0.67	$ 0.99
Shares excluded from diluted per share amounts because their effect would have been anti-dilutive (in shares)	4.9	4.5	5.5	4.0
2024 Notes
Effect of dilutive securities:
2024 Notes (in shares)	0.6	1.0	0.5	1.1
Stock options
Effect of dilutive securities:
Effect of dilutive securities (in shares)	1.9	1.8	1.7	1.9
Restricted stock
Effect of dilutive securities:
Effect of dilutive securities (in shares)	0.8	0.2	0.5	0.3

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