Share-based Compensation (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	$ 26.6	$ 39.0
RSUs and PSUs
Forfeited/Unexercised (in shares)		0.0
Incentive Award Plan 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock options not granted	36.2
RSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	$ 25.8	$ 9.4
RSUs and PSUs
Beginning of year	4.5	1.8
Granted (in shares)	3.9	2.0
Exercised/Vested (in share)	(0.7)	0.0
Forfeited/Unexercised (in shares)	(0.1)	0.0
End of year	7.6	3.8
Total remaining unearned compensation costs, RSUs and PSUs	$ 89.4	$ 61.3
Recognition period of unrecognized compensation cost	1 year 4 months 24 days	1 year 7 months 6 days
PSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	$ 1.1	$ 1.3
RSUs and PSUs
Beginning of year	1.4	0.9
Granted (in shares)	0.9	0.5
Exercised/Vested (in share)	0.0	0.0
Forfeited/Unexercised (in shares)	0.0
End of year	2.3	1.4
Total remaining unearned compensation costs, RSUs and PSUs	$ 11.6	$ 12.0
Recognition period of unrecognized compensation cost	1 year 10 months 24 days	2 years 3 months 18 days
Phantom Share Units (PSUs)
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	$ (0.3)	$ 28.3
Stock Options
Stock Options
Outstanding at beginning of year	4.8	7.9
Granted (in shares)	0.0	0.0
Exercised/Vested (in share)	(0.2)	(0.8)
Forfeited/Unexercised (in shares)	(0.1)	0.0
Outstanding at end of year	4.5	7.1
RSUs and PSUs
Total remaining unearned compensation costs, Stock Options	$ 0.0	$ 0.0
Recognition period of unrecognized compensation cost	0 years	0 years
Cost of revenues
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	$ 9.3	$ 13.0
Cost of revenues | RSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	9.6	3.8
Cost of revenues | PSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	0.1	0.1
Cost of revenues | Phantom Share Units (PSUs)
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	(0.4)	9.1
Selling, general and administrative costs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	17.3	26.0
Selling, general and administrative costs | RSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	16.2	5.6
Selling, general and administrative costs | PSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	1.0	1.2
Selling, general and administrative costs | Phantom Share Units (PSUs)
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	$ 0.1	$ 19.2