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Long-term Debt (Tables)
 12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
 
 
 
 
 
 
Fair Value (1)
(in millions)
 
December 31,
2018
 
December 31,
2017
 
December 31,
2018
 
December 31,
2017
3.75% Notes due 2027
 
$
600.0

 
$
600.0

 
$
579.4

 
$
607.1

3.5% Notes due 2024
 
400.0

 
400.0

 
386.4

 
403.7

3.75% Notes due 2022
 
350.0

 
350.0

 
345.5

 
358.9

5.125% Notes due 2020
 
250.0

 
250.0

 
255.0

 
264.8

Unamortized discount, debt issuance costs and other
 
(12.2
)
 
(13.8
)
 
 
 
 
Total long term-debt
 
$
1,587.8

 
$
1,586.2

 
 
 
 
(1) 
The fair value is estimated based on current yield rates plus the Company’s estimated credit spread available for financings with similar terms and maturities. Based on these inputs, debt instruments are classified as Level 2 in the fair value hierarchy.
Debt Instrument Redemption The Notes may also be redeemed at any time after the dates noted below, in whole or in part, at the Company's option at 100.0% of the principal amount, plus accrued and unpaid interest.
Debt Instrument
 
Date
 
Spread
3.75% Notes due 2027
 
September 1, 2027
 
25 basis points
3.5% Notes due 2024
 
October 1, 2024
 
20 basis points
3.75% Notes due 2022
 
August 15, 2022
 
35 basis points
5.125% Notes due 2020
 
September 15, 2020
 
35 basis points