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

12 Months Ended

Dec. 31, 2016

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,
			2016				2015
			Book Value		Fair Value 1		Book Value		Fair Value 1
2.25% Senior Notes due 2017 (less unamortized discount and issuance costs of $0.1 and $0.5, respectively)	2.30	%	$	299.4	$	301.4	$	298.8	$	299.3
4.00% Senior Notes due 2022 (less unamortized discount and issuance costs of $1.7 and $1.3, respectively)	4.13	%	247.0		258.4		246.4		250.9
3.75% Senior Notes due 2023 (less unamortized discount and issuance costs of $0.9 and $2.5, respectively)	4.32	%	496.6		503.3		496.0		484.8
4.20% Senior Notes due 2024 (less unamortized discount and issuance costs of $0.8 and $3.0, respectively)	4.24	%	496.2		511.6		495.8		496.4
Other notes payable and capitalized leases			65.4		65.4		75.2		75.2
Total long-term debt			1,604.6				1,612.2
Less: current portion			323.9				1.9
Long-term debt, excluding current portion			$	1,280.7			$	1,610.3

1 See Note 10 for information on the fair value measurement of our long-term debt.