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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2016
Income Tax Disclosure [Abstract]  
Schedule of effective income tax rate reconciliation
The effective tax rates for the three and six months ended June 30, 2016 and June 30, 2015 include the tax expense (benefit) of the following discrete items (in millions):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Equity investments
$
0.6

 
$
—

 
$
(1.3
)
 
$
—

Restructuring charges
$
—

 
$
0.2

 
$
—

 
$
(1.1
)
Acquisition-related charges
$
(3.1
)
 
$
—

 
$
(3.1
)
 
$
—