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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule Of Stock Repurchase Activities
The following table provides the stock repurchase activities during the years ended December 31, 2017, 2016, and 2015 (in millions, except per share amounts):
 
Years Ended December 31,
 
2017
 
2016
 
2015
Shares repurchased
7.3

 
0.2

 
1.1

Average price per share
$
310.32

 
$
201.70

 
$
167.41

Value of shares repurchased
$
2,274.0

 
$
42.5

 
$
183.7
Components of Accumulated Other Comprehensive Income (Loss), Net of Tax
The components of accumulated other comprehensive income (loss) net of tax, for the years ended December 31, 2017, and 2016, are as follows (in millions):
 
Year Ended December 31, 2017
 
Gains  (Losses)
on Hedge
Instruments
 
Unrealized  Gains
(Losses) on
Available-for-Sale Securities
 
Foreign
Currency
Translation
Gains  (Losses)
 
Employee Benefit Plans
 
Total
Beginning balance
$
5.0

 
$
(8.6
)
 
$
(1.3
)
 
$
(4.0
)

$
(8.9
)
Other comprehensive income (loss) before reclassifications
(8.6
)
 
(2.7
)
 
3.6

 
(0.3
)
 
(8.0
)
Reclassified from accumulated other comprehensive loss
1.2

 
—

 
—

 
0.2

 
1.4

Net current-period other comprehensive income (loss)
(7.4
)
 
(2.7
)
 
3.6

 
(0.1
)
 
(6.6
)
Ending balance
$
(2.4
)
 
$
(11.3
)
 
$
2.3

 
$
(4.1
)
 
$
(15.5
)
 
 
 
 
 
 
 
 
 
 
 
Year Ended December 31, 2016
 
Gains  (Losses)
on Hedge
Instruments
 
Unrealized Gains
(Losses) on
Available-for-Sale Securities
 
Foreign
Currency
Translation
Gains  (Losses)
 
Employee Benefit Plans
 
Total
Beginning balance
$
1.5

 
$
(4.2
)
 
$
(3.3
)
 
$
(3.5
)
 
$
(9.5
)
Other comprehensive income (loss) before reclassifications
4.1

 
(4.6
)
 
2.0

 
(0.7
)
 
0.8

Reclassified from accumulated other comprehensive loss
(0.6
)
 
0.2

 
—

 
0.2

 
(0.2
)
Net current-period other comprehensive income (loss)
3.5

 
(4.4
)
 
2.0

 
(0.5
)
 
0.6

Ending balance
$
5.0

 
$
(8.6
)
 
$
(1.3
)
 
$
(4.0
)
 
$
(8.9
)