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Fair Value of Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2014
Fair Value Disclosures [Abstract]  
Fair Value By Balance Sheet Grouping
The estimated fair value of financial instruments at March 31, 2014 was as follows: 
 
 
 
Fair Value Measurements at Reporting Date Using
(In millions)
Total
Carrying
Amount
 
Total
Estimated
Fair Value
 
Quoted Prices in
Active Markets for
Identical Assets(Level 1)
 
Significant
Observable
Inputs
(Level 2)
Cash and cash equivalents
$
837.7

 
$
837.7

 
$
837.7

 
$
—

Derivative financial instruments:
 
 
 
 
 
 
 
Assets
8.9

 
8.9

 
—

 
8.9

Liabilities
14.5

 
14.5

 
—

 
14.5

Debt
1,946.8

 
2,102.4

 
2,058.1

 
44.3

The estimated fair value of financial instruments at December 31, 2013 was as follows:
 
 
 
 
Fair Value Measurements at Reporting Date Using
(In millions)
Total
Carrying
Amount
 
Total
Estimated
Fair Value
 
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
 
Significant
Observable
Inputs
(Level 2)
Cash and cash equivalents
$
1,026.8

 
$
1,026.8

 
$
1,026.8

 
$
—

Derivative financial instruments:
 
 
 
 
 
 
 
Assets
4.3

 
4.3

 
—

 
4.3

Liabilities
21.6

 
21.6

 
—

 
21.6

Debt
1,947.3

 
2,072.6

 
2,027.8

 
44.8