Debt and Credit Arrangements (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Summary of Carrying Amounts and Fair Values of Long-term Debt

A summary of the carrying amounts and fair values of our long-term debt is listed below.

	Effective Interest Rate	September 30, 2018				December 31, 2017
		Book Value		Fair Value 1		Book Value		Fair Value 1
3.50% Senior Notes due 2020 (less unamortized discount and issuance costs of $0.9 and $2.9, respectively)	3.89%	$	496.2	$	500.1	$	—	$	—
3.75% Senior Notes due 2021 (less unamortized discount and issuance costs of $0.3 and $3.2, respectively)	3.98%	496.5		500.8		—		—
4.00% Senior Notes due 2022 (less unamortized discount and issuance costs of $1.1 and $0.9, respectively)	4.13%	248.0		249.9		247.6		259.0
3.75% Senior Notes due 2023 (less unamortized discount and issuance costs of $0.7 and $1.8, respectively)	4.32%	497.5		494.9		497.1		513.2
4.20% Senior Notes due 2024 (less unamortized discount and issuance costs of $0.6 and $2.3, respectively)	4.24%	497.1		501.6		496.7		524.2
4.65% Senior Notes due 2028 (less unamortized discount and issuance costs of $1.7 and $4.4, respectively)	4.78%	493.9		500.6		—		—
5.40% Senior Notes due 2048 (less unamortized discount and issuance costs of $2.8 and $5.6, respectively)	5.48%	491.6		497.3		—		—
Other notes payable and capitalized leases		40.7		40.7		46.2		46.2
Total long-term debt		3,261.5				1,287.6
Less: current portion		0.1				2.0
Long-term debt, excluding current portion		$	3,261.4			$	1,285.6

1 See Note 13 for information on the fair value measurement of our long-term debt.

Summary of New Debt Issuance [Table Text Block]

The issuance was comprised of the following four series of notes:

Senior Notes	Par Value		Discount at Issuance		Net Price at Issuance		Issuance Cost		Net Proceeds
3.50% Senior Notes Due 2020	$	500.0	$	1.0	$	499.0	$	2.9	$	496.1
3.75% Senior Notes Due 2021	500.0		0.3		499.7		3.2		496.5
4.65% Senior Notes Due 2028	500.0		1.7		498.3		4.4		493.9
5.40% Senior Notes Due 2048	500.0		2.8		497.2		5.6		491.6
Total	$	2,000.0	$	5.8	$	1,994.2	$	16.1	$	1,978.1