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Long-term Debt (Tables)
 9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt
A summary of the Company's long-term debt follows:
(in millions)
Fair Value1
September 30, 2018December 31, 2017September 30, 2018December 31, 2017
3.75% Notes due 2027
$600.0 $600.0 $570.3 $607.1 
3.5% Notes due 2024
400.0 400.0 384.3 403.7 
3.75% Notes due 2022
350.0 350.0 347.4 358.9 
5.125% Notes due 2020
250.0 250.0 256.9 264.8 
Unamortized discount, debt issuance costs, and other (12.6)(13.8)
Total long term-debt $1,587.4 $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, the debt instruments are classified as Level 2 in the fair value hierarchy.