Summary of Accounting Policies (Narrative) (Details) shares in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) reporting_unit shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Jan. 01, 2020 USD ($)	Dec. 31, 2018 USD ($)
Summary Of Accounting Policies [Line Items]
Increase (decrease) in retained earnings	$ 11,563,800,000	$ 11,563,800,000	$ 10,479,800,000	$ 9,491,900,000		$ 7,738,500,000
Cash equivalents	0	$ 0	$ 0
Antidilutive securities excluded from computation of earnings per share (in shares) | shares		521	208	627
Foreign currency transaction gains (losses)		$ (1,400,000)	$ (4,500,000)	$ (3,500,000)
Number of reporting units | reporting_unit		34
Goodwill	14,094,500,000	$ 14,094,500,000	13,966,000,000	10,387,300,000
Loss from impairment		99,500,000	0	0
Research and development expense		528,400,000	423,600,000	379,700,000
Allowance for doubtful accounts receivable and sales returns and allowances net current	19,700,000	19,700,000	28,100,000
Deferred commission, non-current	32,500,000	32,500,000	25,000,000.0
Deferred commission, current	24,200,000	24,200,000	17,500,000
Deferred commissions expense		27,200,000	30,100,000	30,100,000
Remaining performance obligations	3,790,400,000	3,790,400,000
Capitalized computer software, net	$ 65,900,000	$ 65,900,000	43,100,000
Software-as-a-service
Summary Of Accounting Policies [Line Items]
Number of days for payment (in days)		30 days
Subscription term (in years)		1 year
Software licenses
Summary Of Accounting Policies [Line Items]
Subscription term (in years)		1 year
Royalty rate
Summary Of Accounting Policies [Line Items]
Intangible assets measurement input	0.005
Intangible assets measurement input increase (decrease)	0.035
Trade names
Summary Of Accounting Policies [Line Items]
Loss from impairment	$ 94,400,000
Software development
Summary Of Accounting Policies [Line Items]
Loss from impairment	5,100,000
Minimum
Summary Of Accounting Policies [Line Items]
Goodwill	0	$ 0
Minimum | Software licenses
Summary Of Accounting Policies [Line Items]
Number of days for payment (in days)		30 days
Minimum | PCS
Summary Of Accounting Policies [Line Items]
Number of days for payment (in days)		30 days
Minimum | Engineered products
Summary Of Accounting Policies [Line Items]
Number of days for payment (in days)		30 days
Maximum
Summary Of Accounting Policies [Line Items]
Goodwill	$ 3,245,300,000,000	$ 3,245,300,000,000
Maximum | Software licenses
Summary Of Accounting Policies [Line Items]
Number of days for payment (in days)		60 days
Maximum | PCS
Summary Of Accounting Policies [Line Items]
Number of days for payment (in days)		60 days
Maximum | Engineered products
Summary Of Accounting Policies [Line Items]
Number of days for payment (in days)		60 days
Cumulative Effect, Period of Adoption, Adjustment
Summary Of Accounting Policies [Line Items]
Increase (decrease) in retained earnings				(1,700,000)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations, percentage (as a percent)	68.00%	68.00%
Remaining performance obligations, expected timing of revenue recognition	12 months	12 months
Retained earnings
Summary Of Accounting Policies [Line Items]
Increase (decrease) in retained earnings	$ 9,455,600,000	$ 9,455,600,000	$ 8,546,200,000	7,818,000,000		$ 6,247,700,000
Retained earnings | Cumulative Effect, Period of Adoption, Adjustment
Summary Of Accounting Policies [Line Items]
Increase (decrease) in retained earnings				$ (1,700,000)	$ (1,700,000)