〜あっての
which only exists because of, owes everything to
Noun A + あっての + Noun B
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AあってのB means B can only exist because A is there: お客様あっての商売です, "our business exists only thanks to our customers".
A is the essential foundation (customers, health, fans, cooperation, failure), and B is what depends on it. The sentence usually ends with だ or です and states a conviction or a note of gratitude.
It's often used humbly, to credit others: 皆さんの協力あっての成功です, "this success was only possible thanks to your cooperation". It also works as a life lesson: 健康あっての人生だ, "without health, there's no life worth living".
Don't confuse it with あっても, "even if there is", or としての, "as a".
Examples
お客様あっての商売です。
Our business exists only thanks to our customers.
健康あっての人生だ。
Without your health, you have nothing.
ファンあっての選手だと思っている。
I believe a player is nothing without the fans.
失敗あっての成功だ。
Success is built on failure.
今回の成功は皆さんのご協力あってのことです。
This success was only possible thanks to your cooperation.