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Stock-Based Compensation - Narrative (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum employee subscription rate	10.00%
Common stock discount rate from market price for employees	5.00%
Stock based compensation expense, accelerated vesting	$ 9.6	$ 29.4
Purchase price of common stock, percent of market value, not less than	100.00%
Stock based compensation expense	$ 104.5	133.8	$ 83.1
Nonvested options granted, unrecognized compensation expense	$ 59.9
Nonvested options granted, period for recognition	2 years 1 month 6 days
Options exercised, total intrinsic value	$ 109.4	124.6	$ 90.6
Proceeds from stock options exercised	$ 64.9	$ 58.8
Nonvested shares granted (in shares)	321	410
Nonvested awards other than options granted, unrecognized compensation expense	$ 77.9
Nonvested awards other than options granted, weighted average period for recognition	1 year 9 months 18 days
Stock issued during period under employee stock purchase plan (in shares)	21	20	20
Proceeds from issuance of shares under employee stock purchase plan	$ 6.8	$ 5.4	$ 4.2
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period	10 years
Stock based compensation expense	$ 32.0	23.2	18.3
Stock options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Stock options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 72.5	$ 109.7	$ 63.0
Restricted stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Restricted stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Incentive Plan 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)	4,544

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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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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