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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2019
Income Tax Disclosure [Abstract]  
Schedule of Income before Income Tax, Domestic and Foreign
Income before income taxes was taxed under the following jurisdictions:
 
 
Year Ended December 31,

 
2019
 
2018
 
2017
Domestic
 
$
854.1

 
$
762.3

 
$
608.3

Foreign
 
95.6

 
78.2

 
52.4

Total
 
$
949.7

 
$
840.5

 
$
660.7


Schedule of Components of Income Tax Expense (Benefit)
Components of Income tax expense (benefit) consist of the following:
 
 
Year Ended December 31,
 
 
2019
 
2018
 
2017
Current:
 
 
 
 
 
 
Federal
 
$
224.7

 
$
192.6

 
$
258.9

State
 
56.1

 
43.3

 
29.8

Foreign
 
20.0

 
17.7

 
21.3

Total current
 
300.8

 
253.6

 
310.0

Deferred:
 
 
 
 
 
 
Domestic
 
(83.0
)
 
(52.7
)
 
(167.6
)
Foreign
 
(4.9
)
 
(3.4
)
 
(4.8
)
Total deferred
 
(87.9
)
 
(56.1
)
 
(172.4
)
Income tax expense
 
$
212.9

 
$
197.5

 
$
137.6


Schedule of Effective Income Tax Rate Reconciliation
The reconciliation between the statutory tax rate expressed as a percentage of income before income taxes and the effective tax rate was as follows:
 
 
Year Ended December 31,
 
 
2019
 
2018
 
2017
Statutory federal income tax rate
 
$
199.4

 
21.0
 %
 
$
176.5

 
21.0
 %
 
$
231.1

 
35.0
 %
State taxes, net of federal effect
 
35.4

 
3.7

 
31.1

 
3.7

 
18.3

 
2.8

Excess tax benefit of equity awards
 
(26.8
)
 
(2.8
)
 
(19.7
)
 
(2.3
)
 
(36.2
)
 
(5.5
)
Effect of rates different than statutory
 
0.8

 
0.1

 
0.6

 
0.1

 
(6.3
)
 
(1.0
)
Tax on foreign earnings
 
2.1

 
0.2

 
2.8

 
0.3

 
1.0

 
0.1

Effect of TCJA on deferred taxes and repatriation tax
 

 

 
(1.9
)
 
(0.2
)
 
(75.5
)
 
(11.4
)
Other
 
2.0

 
0.2

 
8.1

 
0.9

 
5.2

 
0.8

Effective tax rate
 
$
212.9

 
22.4
 %
 
$
197.5

 
23.5
 %
 
$
137.6

 
20.8
 %

Schedule of Deferred Tax Assets and Liabilities
The tax effect of temporary differences that give rise to net deferred income tax liabilities is presented below:
 
 
December 31,
 
 
2019
 
2018
Deferred tax assets:
 
 
 
 
Contract liabilities
 
$
40.7

 
$

Equity compensation plans
 
21.1

 
17.7

Net operating loss and credit carryforwards, net
 
20.1

 
23.8

Payroll and benefits
 
9.6

 
9.3

Rent
 
7.3

 
7.5

Accounts receivable
 
7.0

 
6.5

Other
 
14.1

 
10.0

Total deferred tax assets
 
119.9

 
74.8

 
 
 
 
 
Deferred tax liabilities:
 
 
 
 
Acquisition-related intangibles
 
112.2

 
148.6

Property and equipment
 
27.0

 
20.0

International investments
 
19.2

 
19.2

Other
 
3.3

 
11.7

Total deferred tax liabilities
 
161.7

 
199.5

Deferred tax asset valuation allowance
 
16.8

 
17.2

Net deferred tax liabilities
 
$
58.6

 
$
141.9


Schedule of Unrecognized Tax Benefits Roll Forward
Changes in the Company's unrecognized tax benefits as of December 31, 2019, 2018 and 2017 were as follows:
 
 
Year Ended December 31,
 
 
2019
 
2018
 
2017
Balance as of January 1
 
$
15.1

 
$

 
$

Additions for tax positions related to current year
 
2.6

 
15.1

 

Balance as of December 31
 
$
17.7

 
$
15.1

 
$