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Stock-Based Compensation (Compensation Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 30.2	$ 31.1	$ 25.5
Tax benefit related to stock-based compensation expense	2.6	2.5	3.0
Unrecognized compensation cost related to non-vested stock-based compensation arrangements	$ 19.9
Unrecognized compensation cost expected to be recognized over weighted average period (in years)	1 year 7 months 20 days
Tax benefits related to stock options exercised and vesting of restricted stock and RSUs	$ 4.3	3.3	3.4
Restricted Stock Units (RSUs) [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	30.0	29.4	21.7
Stock Options [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	0.1	0.9	1.6
Restricted Stock [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 0.1	$ 0.8	$ 2.2

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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