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Fair Value (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments
The net asset (liability) amounts recorded in the balance sheet (carrying amount) and the estimated fair values of our remaining financial instruments at December 31 consisted of the following:
 
 
2017
 
2016
 
 
Carrying
Amount
 
Fair Value
 
Carrying
Amount
 
Fair Value
Available-for-sale securities
 
$
3.7

 
$
3.7

 
$
2.8

 
$
2.8

Debt maturing within one year(1)
 
(25.7
)
 
(25.7
)
 
(18.1
)
 
(18.1
)
Long-term debt(1)
 
(1,872.2
)
 
(1,718.6
)
 
(1,875.8
)
 
(1,877.5
)
Foreign exchange forward contracts
 
—

 
—

 
(2.4
)
 
(2.4
)

(1) The carrying value of debt maturing within one year and long-term debt is presented net of debt issuance costs and includes any related discount or premium and unamortized deferred gains on terminated interest-rate swap agreements, as applicable.