Debt and Financing Arrangements (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Schedule of financing structure

The following table shows the Company’s financing structure:

	Outstanding(1)		Unamortized discount and debt issuance costs		Balance(2)
December 31, 2016
2010 Senior notes due 2020 (discount is based on imputed interest rate of 2.80%)	300.0		1.8		298.2
2015 Senior notes due 2025 (discount is based on imputed interest rate of 2.18%)	500.0		4.0		496.0
Swiss office building mortgage	16.9		—		16.9
Swiss office building credit facility	5.1		—		5.1
$900 million Secured letter of credit facility — uncommitted	458.0		—		—
$200 million Secured letter of credit facility — committed	—		—		—
	$	1,280.0	$	5.8	$	816.2
December 31, 2015
2006 Senior notes due 2016 (discount is based on imputed interest rate of 3.77%)	$	500.0	$	0.5	$	499.5
2010 Senior notes due 2020 (discount is based on imputed interest rate of 2.78%)	300.0		2.3		297.7
2015 Senior notes due 2025 (discount is based on imputed interest rate of 2.18%)	500.0		4.3		495.7
Swiss office building mortgage	17.9		—		17.9
Swiss office building credit facility	5.1		—		5.1
$1,000 million Secured letter of credit facility — uncommitted	507.5		—		—
$150 million Secured letter of credit facility — committed	—		—		—
	$	1,830.5	$	7.1	$	1,315.9

⁽¹⁾  Indicates utilization of commitment amount, not drawn borrowings.

⁽²⁾  Represents the principal amount borrowed, net of unamortized discount and debt issuance costs.

Schedule of debt maturities

The following table reflects the Company’s debt maturities, which includes its senior notes and other long-term debt:

	Amount
2017	$	5.4
2018	0.3
2019	0.3
2020	300.3
2021	0.3
2022 and thereafter	515.4
Total	$	822.0