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Stock-Based Compensation - Narrative (Details) - USD ($) shares in Thousands, $ in Millions			12 Months Ended
	Jul. 01, 2020	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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			$ 121.7	104.5	133.8
Nonvested options granted, unrecognized compensation expense			$ 61.9
Nonvested options granted, period for recognition			1 year 8 months 12 days
Options exercised, total intrinsic value			$ 155.4	109.4	$ 124.6
Proceeds from stock options exercised			$ 105.5	$ 64.9
Nonvested shares granted (in shares)			285	321
Nonvested awards other than options granted, unrecognized compensation expense			$ 89.8
Nonvested awards other than options granted, weighted average period for recognition			1 year 8 months 12 days
Stock issued during period under employee stock purchase plan (in shares)			31	21	20
Proceeds from issuance of shares under employee stock purchase plan			$ 10.5	$ 6.8	$ 5.4
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum designated percent of eligible earnings per employee	10.00%	10.00%
Discount percent	10.00%	5.00%
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period			10 years
Stock based compensation expense			$ 41.4	32.0	23.2
Stock options | Weighted Average
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense			$ 79.4	$ 72.5	$ 109.7
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)			3,254

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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