Note 13. Common Stock and Stock-based Compensation Stockholders Equity (Details) - USD ($) $ in Millions	3 Months Ended							12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022		Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 09, 2022	Sep. 09, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Treasury Stock, Value	$ 0.7							$ 0.6	$ 0.7
Treasury Stock, Value, Acquired, Cost Method									51.8	$ 706.6
2022 Share Repurchase Program
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock Repurchase Program, Authorized Amount											$ 250.0
2021-2022 Share Repurchase Program
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock Repurchase Program, Authorized Amount												$ 250.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 21.3	$ 33.7	$ 47.8		$ 98.1	$ 98.1	$ 250.0		$ 21.3	98.1
Total Shares Repurchased Under Program	7,953,336								7,953,336
Total Shares Repurchased Under Program, Value	$ 228.7								$ 228.7
Accelerated Share Repurchase Program
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock Repurchase Program, Authorized Amount						$ 125.0				125.0
Treasury Stock, Shares, Acquired						3,300,000
Treasury Stock, Value						$ 100.0				100.0
Treasury Stock, Value, Acquired, Cost Method									$ 0.0	$ 125.0
Private Share Repurchase Agreement
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Treasury Stock, Shares, Acquired										16,900,000
Treasury Stock, Value, Acquired, Cost Method										$ 472.5
Treasury Stock, Common
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Treasury Stock, Shares, Acquired									2,000,000.0	25,200,000
Treasury Stock, Value, Acquired, Cost Method									$ 51.8	$ 706.6
Treasury Stock, Common | 2022 Share Repurchase Program
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Treasury Stock, Shares, Acquired	0							0
Treasury Stock, Common | 2021-2022 Share Repurchase Program
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Treasury Stock, Shares, Acquired	427,383	610,000	1,760,462	[1]	0	5,155,491	0		2,800,000	28,500,000
Treasury Stock, Value, Acquired, Cost Method	$ 12.4	$ 14.1	$ 50.3	[1]	$ 0.0	$ 151.9	$ 0.0		$ 76.8	$ 806.6
Treasury Stock, Common | Accelerated Share Repurchase Program
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Treasury Stock, Shares, Acquired			760,602						800,000	3,300,000
Treasury Stock, Value, Acquired, Cost Method			$ 25.0						$ 25.0	$ 100.0

[1] Share repurchases during the second quarter of 2022 included 760,602 shares at a cost of $25.0 million representing the final settlement of the ASR, which was funded in December 2021 but a portion of which remained outstanding as of December 31, 2021.