Long-term Debt (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Schedule of Long-term Debt

A summary of the Company's long-term debt follows:

(in millions)							Fair Value (1)
	March 31, 2018			December 31, 2017			March 31, 2018		December 31, 2017
3.75% Notes due 2027	$	600.0		$	600.0		$	582.6	$	607.1
3.5% Notes due 2024	400.0			400.0			391.6		403.7
3.75% Notes due 2022	350.0			350.0			352.3		358.9
5.125% Notes due 2020	250.0			250.0			260.9		264.8
Unamortized discount, debt issuance costs, and other	(13.6		)	(13.8		)
Total long term-debt	$	1,586.4		$	1,586.2

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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.