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Debt and Credit Agreements Schedule of Long-term Debt Instruments (Tables) | 12 Months Ended
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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.

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