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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]  
Reconciliation between the statutory U.S. Federal income tax rate and the Company's effective income tax rate on income before income taxes
The following is a reconciliation between the statutory U.S. federal income tax rate and the Company’s effective income tax rate on income before income taxes:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
Statutory rate
35.0
 %
 
35.0
 %
 
35.0
 %
 
35.0
 %
State taxes
1.4

 
1.3

 
1.4

 
1.2

Noncontrolling interest in partially-owned subsidiaries
(1.4
)
 
(0.8
)
 
(0.9
)
 
(1.0
)
Settlements with tax authorities
—

 
—

 
(2.1
)
 
—

Equity compensation
(0.2
)
 
—

 
0.8

 
—

Other, net
2.1

 
0.3

 
1.8

 
0.4

Effective rate
36.9
 %
 
35.8
 %
 
36.0
 %
 
35.6
 %
Change in unrecognized tax benefits
The change in unrecognized tax benefits for the nine months ended September 30, 2017 and 2016 was as follows:
 
Nine Months Ended
September 30,
 
2017
 
2016
 
(in millions)
Beginning balance
$
28.2

 
$
65.2

Additions for tax positions related to the current year
—

 
4.6

Additions for tax positions of prior years
0.2

 
1.0

Settlements
(23.3
)
 
—

Expiration of statute of limitations
—

 
(0.1
)
Ending balance
$
5.1

 
$
70.7