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Income Taxes (Tables)
 6 Months Ended
Jun. 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
June 30,
 
Six Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
Statutory rate
35.0
 %
 
35.0
 %
 
35.0
 %
 
35.0
 %
State taxes
1.5

 
1.2

 
1.5

 
1.1

Noncontrolling interest in partially-owned subsidiaries
(0.7
)
 
(1.0
)
 
(0.6
)
 
(1.1
)
Settlements with tax authorities
—

 
—

 
(3.5
)
 
—

Equity compensation
3.0

 
—

 
1.5

 
—

Other, net
2.1

 
(0.1
)
 
1.6

 
0.5

Effective rate
40.9
 %
 
35.1
 %
 
35.5
 %
 
35.5
 %
Change in unrecognized tax benefits
The change in unrecognized tax benefits for the six months ended June 30, 2017 and 2016 was as follows:
 
Six Months Ended
June 30,
 
2017
 
2016
 
(in millions)
Beginning balance
$
28.2

 
$
65.2

Additions for tax positions related to the current year
—

 
3.0

Additions for tax positions of prior years
0.1

 
1.0

Reductions for tax positions of prior years
—

 
(0.1
)
Settlements
(23.3
)
 
—

Ending balance
$
5.0

 
$
69.1