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Debt and Credit Agreements Summary of New Debt Issuance (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
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 |

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