Share-based Compensation (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	$ 19.5	$ 10.6	$ 78.5	$ 107.8
Incentive Award Plan 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock options not granted	31.2		31.2
RSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	$ 18.2	$ 10.9	$ 64.8	$ 34.2
RSUs and PSUs
Beginning of year			4.5	1.8
Granted (in shares)			9.9	2.9
Exercised/Vested (in share)			(2.5)	(0.6)
Forfeited/Unexercised (in shares)			(0.6)	(0.4)
End of year	11.3	3.7	11.3	3.7
Total remaining unearned compensation costs, RSUs and PSUs	$ 111.5	$ 50.5	$ 111.5	$ 50.5
Recognition period of unrecognized compensation cost			1 year 4 months 2 days	1 year 2 months 12 days
PSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	$ 1.1	$ 1.1	$ 3.2	$ 3.8
RSUs and PSUs
Beginning of year			1.4	0.9
Granted (in shares)			1.2	0.5
Exercised/Vested (in share)			0.0	0.0
Forfeited/Unexercised (in shares)			(0.3)	(0.1)
End of year	2.3	1.3	2.3	1.3
Total remaining unearned compensation costs, RSUs and PSUs	$ 7.9	$ 8.8	$ 7.9	$ 8.8
Recognition period of unrecognized compensation cost			1 year 7 months 28 days	1 year 9 months 21 days
Phantom Share Units (PSUs)
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	(0.1)	(1.4)	$ 10.2	$ 69.3
Stock Options
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	$ 0.3	$ 0.0	$ 0.3	$ 0.5
Stock Options
Outstanding at beginning of year			4.8	7.8
Granted (in shares)			0.0	0.0
Exercised/Vested (in share)			(0.3)	(2.7)
Forfeited/Unexercised (in shares)			(0.1)	0.0
Outstanding at end of year	4.4	5.1	4.4	5.1
RSUs and PSUs
Total remaining unearned compensation costs, Stock Options	$ 0.0	$ 0.0	$ 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	4.2	3.6	$ 25.4	$ 34.5
Cost of revenues \| RSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	4.5	3.9	21.9	12.1
Cost of revenues \| PSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	0.0	0.1	0.2	0.4
Cost of revenues \| Phantom Share Units (PSUs)
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	(0.3)	(0.4)	3.3	21.9
Cost of revenues \| Stock Options
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	0.0	0.0	0.0	0.1
Selling, general and administrative costs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	15.3	7.0	53.1	73.3
Selling, general and administrative costs \| RSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	13.7	7.0	42.9	22.1
Selling, general and administrative costs \| PSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	1.1	1.0	3.0	3.4
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	0.2	(1.0)	6.9	47.4
Selling, general and administrative costs \| Stock Options
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based Payment Arrangement, Expense, after Tax	$ 0.3	$ 0.0	$ 0.3	$ 0.4

Amount, after tax, of expense for award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Number of share options (or share units) exercised during the current period.

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