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Stock-Based Compensation - Narrative (Details) $ in Millions			1 Months Ended	12 Months Ended
	Jun. 24, 2020	May 09, 2019 shares	May 31, 2017 day	Dec. 31, 2020 USD ($) award shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) | shares		3,700,000
Share-based compensation arrangement by share-based payment award, number of additional shares authorized (in shares) | shares		1,500,000
Number of stock-based compensation plans | award				4
Total stock-based compensation cost recognized				$ 63.9	$ 45.6	$ 33.9
Total unrecognized compensation cost				5.5
Tax benefit from stock option and restricted stock units				11.5	9.9	8.0
Vesting period	1 year
Shares exercised, total intrinsic value				8.7	5.7	1.9
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost				$ 42.2
Compensation cost expected recognition weighted average period (in years)				1 year 2 months 12 days
Shares granted fair value				$ 37.0	34.0	16.8
Shares vested fair value				$ 11.9	$ 7.6	9.2
Deferred stock units (in shares) | shares				472,000	260,000
Restricted Stock Units (RSUs) | Non-Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				12 months
Restricted Stock Units (RSUs) | Certain Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Performance Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted fair value				$ 58.5	$ 19.0	18.3
Shares vested fair value				$ 21.7	$ 9.3	12.0
Deferred stock units (in shares) | shares				582,000	449,000
Performance Based Restricted Stock Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance goals tracking period				1 year
Performance Based Restricted Stock Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance goals tracking period				3 years
TSR
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost				$ 74.1
Compensation cost expected recognition weighted average period (in years)				2 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period			10 years
Number of consecutive trading days | day			20
Award vesting rights			75.00%
Share-based compensation granted			5 years
Share-based compensation nonvested			25.00%
Derived service period				3 years
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost				$ 9.6
Vesting period				3 years
Compensation cost expected recognition weighted average period (in years)				1 year 1 month 6 days
Expiration period				10 years
Grant date fair value of shares				$ 9.3	$ 7.2	$ 5.2
Stock Option | First anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights				33.00%
Stock Option | Second anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights				33.00%
Stock Option | Third anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights				33.00%
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				200 days
Deferred stock units (in shares) | shares				54,000	63,000
Common Stock Issued
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units of common stock available for grant (in shares) | shares				3,600,000

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