Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt [Abstract]

Available and Unused Credit Lines

Available and unused credit lines at December 31, 2017 and 2016 were (in millions):

	2017		2016
Credit Facility	$	2,500.0	$	2,500.0
Uncommitted credit lines	1,181.0		1,132.0
Available and unused credit lines	$	3,681.0	$	3,632.0

Long-Term Debt

Long-term debt at December 31, 2017 and 2016 was (in millions):

	2017			2016
6.25% Senior Notes due 2019	$	500.0		$	500.0
4.45% Senior Notes due 2020	1,000.0			1,000.0
3.625% Senior Notes due 2022	1,250.0			1,250.0
3.65% Senior Notes due 2024	750.0			750.0
3.60% Senior Notes due 2026	1,400.0			1,400.0
Other debt	—			0.1
	4,900.0			4,900.1
Unamortized premium (discount), net	6.2			7.6
Unamortized debt issuance costs	(20.3		)	(24.2		)
Unamortized deferred gain from settlement of interest rate swaps	66.4			84.7
Fair value adjustment attributed to outstanding interest rate swaps	(39.4		)	(47.6		)
	4,912.9			4,920.6
Current portion	—			(0.1		)
Long-term debt	$	4,912.9		$	4,920.5

Contractual Maturities of Long-Term Debt

The contractual maturities of our long-term debt at December 31, 2017 are (in millions):

2018	$	—
2019	500.0
2020	1,000.0
2021	—
2022	1,250.0
Thereafter	2,150.0
	$	4,900.0

Components of Interest Expense

Interest expense for the three years ended December 31, 2017 is composed of (in millions):

	2017			2016			2015
Long-term debt	$	201.6		$	205.5		$	210.2
Interest rate swaps	(7.2		)	(13.1		)	(44.1		)
Amortization of deferred gain on interest rate swaps	(12.9		)	(15.4		)	(9.2		)
Commercial paper	12.5			6.8			4.8
Fees	5.6			5.6			5.7
Other	24.9			20.3			13.7
	$	224.5		$	209.7		$	181.1