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Indebtedness
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3 Months Ended |
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Mar. 31, 2015
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| Debt Disclosure [Abstract] | |
| Debt Disclosure [Text Block] | Indebtedness In March 2015, the Company used proceeds from its unsecured credit facility together with available cash on hand to repay all $300 million of its 5.125% senior unsecured notes due March 2015. In March 2015, the Company issued $400 million of 3.75% senior unsecured notes due 2025. The net proceeds from this issuance were used to repay borrowings under the Company's unsecured credit facility and for general corporate purposes. |