Share-Based Payments - Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($) plan $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cost not yet recognized \| $	$ 40.6
Cost not yet recognized, period of recognition	1 year 9 months 18 days
Exercise of option, tax benefit \| $	$ 2.0	$ 3.1	$ 4.5
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Awards granted (in shares) \| shares	0.6	0.5	0.5
Weighted average market value (in dollars per share)	$ 45.84	$ 48.99	$ 55.03
DSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average market value (in dollars per share)	$ 49.33	$ 37.53	$ 56.68
Ratio of cash retainer payments received in stock	0.5
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Awards granted (in shares) \| shares	0.4	0.3	0.3
Weighted average market value (in dollars per share)	$ 49.47	$ 58.12
Weighted-average fair value (in dollars per share)	$ 45.71	52.60	$ 53.31
RSUs and DSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares) \| shares	0.6
Weighted average market value (in dollars per share)	$ 49.23	$ 56.21
Weighted-average fair value (in dollars per share)	$ 45.88
Total intrinsic value, vested in period \| $	$ 12.7	$ 14.8	$ 23.6
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Awards granted (in shares) \| shares	0.3	0.4	0.4
Weighted-average fair value (in dollars per share)	$ 10.06	$ 6.70	$ 9.20
Terms of SBC award	10 years
Total intrinsic value of stock options exercised \| $	$ 0.9	$ 0.8	$ 0.6
Options, RSUs, DSUs and PSUs Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized and available for issuance (in shares) \| shares	5.0
Incentive Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based compensation plans (in plans) \| plan	1

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Ratio Of Cash Retainer Payments Received In Stock

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Share Based Compensation Arrangement By Share Based Payment Award Term Of Award

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Amount of cost not yet recognized for nonvested 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 tax benefit from exercise of option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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 weighted average fair value at grant date for nonvested equity-based awards issued 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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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