Debt and Credit Agreements Schedule of Long-term Debt Instruments (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

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

	Effective Interest Rate		December 31,
			2015				2014
			Book Value		Fair Value 1		Book Value		Fair Value 1
2.25% Senior Notes due 2017 (less unamortized discount and issuance costs of $0.3 and $0.9, respectively)	2.30	%	$	298.8	$	299.3	$	298.3	$	301.2
4.00% Senior Notes due 2022 (less unamortized discount and issuance costs of $2.0 and $1.6, respectively)	4.13	%	246.4		250.9		245.9		255.2
3.75% Senior Notes due 2023 (less unamortized discount and issuance costs of $1.1 and $2.9, respectively)	4.32	%	496.0		484.8		495.5		499.8
4.20% Senior Notes due 2024 (less unamortized discount and issuance costs of $0.8 and $3.4, respectively)	4.24	%	495.8		496.4		495.0		509.8
Other notes payable and capitalized leases			75.2		75.2		80.3		80.3
Total long-term debt			1,612.2				1,615.0
Less: current portion			1.9				2.1
Long-term debt, excluding current portion			$	1,610.3			$	1,612.9

1 See Note 11 for information on the fair value measurement of our long-term debt.